| Rank | House Median Value ▼ | School District / Population |
| 1. | $1,000,001 | Bannockburn School District 106 / 2,015 |
| 1. | $1,000,001 | Glencoe School District 35 / 8,430 |
| 1. | $1,000,001 | Winnetka School District 36 / 11,688 |
| 1. | $1,000,001 | Kenilworth School District 38 / 2,970 |
| 5. | $920,800 | Butler School District 53 / 4,338 |
| 6. | $876,700 | Lake Forest School District 67 / 19,190 |
| 7. | $802,900 | Hinsdale Community Consolidated School District 181 / 25,590 |
| 8. | $801,000 | New Trier Township High School District 203 / 59,234 |
| 9. | $786,100 | Lake Forest Community High School District 115 / 27,343 |
| 10. | $715,100 | Rondout School District 72 / 1,645 |
| 11. | $699,500 | Sunset Ridge School District 29 / 4,041 |
| 12. | $690,500 | Wilmette School District 39 / 26,126 |
| 13. | $618,200 | River Forest School District 90 / 11,166 |
| 14. | $586,100 | Township High School District 113 / 58,968 |
| 15. | $585,600 | Northbrook Elementary School District 27 / 11,349 |
| 16. | $582,800 | Deerfield School District 109 / 21,058 |
| 17. | $582,400 | Lake Bluff Elementary School District 65 / 7,946 |
| 18. | $579,500 | Western Springs School District 101 / 9,959 |
| 19. | $577,400 | Lincolnshire-Prairieview School District 103 / 13,374 |
| 20. | $574,700 | North Shore School District 112 / 35,908 |
| 21. | $560,000 | Northbrook/Glenview School District 30 / 10,790 |
| 22. | $549,700 | Community Consolidated School District 180 / 6,550 |
| 23. | $535,300 | Northfield Township High School District 225 / 84,738 |
| 24. | $533,900 | Barrington Community Unit School District 220 / 44,855 |
| 25. | $528,400 | Oak Grove School District 68 / 7,475 |
| 26. | $517,800 | Glenview Community Consolidated School District 34 / 39,322 |
| 27. | $512,400 | West Northfield School District 31 / 9,769 |
| 28. | $498,600 | Northbrook School District 28 / 13,508 |
| 29. | $491,500 | Avoca School District 37 / 5,979 |
| 30. | $477,400 | Hinsdale Township High School District 86 / 74,746 |
| 31. | $477,000 | Lincolnwood School District 74 / 12,422 |
| 32. | $467,100 | Libertyville School District 70 / 18,897 |
| 33. | $458,000 | Kildeer Countryside Community Consolidated School District 96 / 23,238 |
| 34. | $452,500 | Park Ridge Consolidated Community School District 64 / 40,199 |
| 35. | $452,200 | Adlai E. Stevenson High School District 125 / 61,457 |
| 36. | $416,000 | Oak Park and River Forest District 200 / 62,592 |
| 37. | $414,600 | Libertyville Community High School District 128 / 50,156 |
| 38. | $406,200 | Glen Ellyn School District 41 / 29,865 |
| 39. | $402,200 | Evanston Township High School District 202 / 81,872 |
| 39. | $402,200 | Evanston Community Consolidated School District 65 / 81,872 |
| 41. | $401,400 | Lake Zurich Community Unit School District 95 / 31,304 |
| 42. | $400,800 | Frankfort Community Consolidated School District 157C / 16,911 |
| 43. | $396,500 | Elmhurst School District 205 / 46,303 |
| 44. | $395,500 | Gower School District 62 / 9,559 |
| 45. | $395,000 | Lemont-Bromberek Combined School District 113A / 24,160 |
| 46. | $394,200 | Lemont Township High School District 210 / 24,464 |
| 47. | $393,900 | Pleasantdale School District 107 / 8,200 |
| 48. | $393,300 | Oak Park Elementary School District 97 / 51,426 |
| 49. | $391,400 | LaGrange Highlands School District 106 / 8,855 |
| 50. | $389,500 | Naperville Community Unit District 203 / 94,500 |
| 51. | $387,600 | Lyons Township High School District 204 / 68,205 |
| 52. | $383,500 | LaGrange School District 102 / 25,405 |
| 53. | $379,600 | Arlington Heights School District 25 / 49,788 |
| 54. | $377,600 | Nettle Creek Community Consolidated School District 24C / 860 |
| 55. | $377,200 | Fremont School District 79 / 17,415 |
| 56. | $368,000 | East Prairie School District 73 / 4,227 |
| 57. | $365,900 | St. Charles Community Unit School District 303 / 66,890 |
| 58. | $363,900 | Downers Grove Grade School District 58 / 52,817 |
| 59. | $363,600 | Center Cass School District 66 / 10,870 |
| 60. | $362,200 | Riverside School District 96 / 13,570 |
| 61. | $361,200 | Skokie-Fairview School District 72 / 6,609 |
| 62. | $358,400 | Niles Township Community High School District 219 / 94,155 |
| 63. | $358,000 | Central Community Unit School District 301 / 17,009 |
| 64. | $356,600 | Itasca School District 10 / 8,983 |
| 65. | $355,100 | Skokie School District 73-5 / 10,048 |
| 66. | $354,100 | Geneva Community Unit School District 304 / 28,498 |
| 67. | $353,600 | River Trails School District 26 / 15,926 |
| 68. | $350,300 | Morton Grove School District 70 / 8,702 |
| 69. | $349,300 | Cass School District 63 / 8,043 |
| 70. | $348,500 | Skokie School District 68 / 19,918 |
| 71. | $347,400 | Golf Elementary School District 67 / 6,716 |
| 72. | $346,500 | Community Unit School District 200 / 78,853 |
| 73. | $344,700 | Rosemont Elementary School District 78 / 2,112 |
| 74. | $343,700 | Benjamin School District 25 / 6,237 |
| 75. | $341,200 | Bloomingdale School District 13 / 13,507 |
| 76. | $341,100 | Indian Prairie Community Unit School District 204 / 125,546 |
| 77. | $340,900 | Aptakisic-Tripp Community Consolidated School District / 18,334 |
| 78. | $338,900 | Norridge School District 80 / 12,811 |
| 79. | $338,400 | Medinah School District 11 / 6,821 |
| 80. | $338,000 | Mount Prospect School District 57 / 19,645 |
| 80. | $338,000 | Roselle School District 12 / 7,331 |
| 82. | $336,100 | Skokie School District 69 / 17,748 |
| 83. | $335,200 | Westmont Community Unit School District 201 / 12,639 |
| 84. | $333,400 | Prospect Heights School District 23 / 18,120 |
| 85. | $333,200 | Hawthorn Community Consolidated School District 73 / 29,745 |
| 86. | $332,600 | Ridgewood Community High School District 234 / 19,068 |
| 87. | $329,300 | Maine Township High School District 207 / 143,019 |
| 88. | $327,100 | Glen Ellyn Community Consolidated School District 89 / 21,433 |
| 89. | $323,900 | Homer Community Consolidated School District 33C / 29,362 |
| 90. | $322,600 | Union Ridge School District 86 / 5,557 |
| 91. | $322,400 | Darien School District 61 / 15,935 |
| 92. | $320,600 | Batavia Unit School District 101 / 31,902 |
| 93. | $318,600 | Orland School District 135 / 53,527 |
| 94. | $318,400 | Community High School District 99 / 108,862 |
| 95. | $318,100 | Lake Park Community High School District 108 / 50,556 |
| 96. | $317,800 | Niles Elementary School District 71 / 7,765 |
| 97. | $317,300 | Pennoyer School District 79 / 5,428 |
| 98. | $316,500 | Palatine Community Consolidated School District 15 / 117,475 |
| 99. | $312,500 | Mokena School District 159 / 17,461 |
| 100. | $311,900 | Will County School District 92 / 14,473 |
| 101. | $310,800 | Salt Creek School District 48 / 9,136 |
| 102. | $308,400 | Township High School District 214 / 250,143 |
| 103. | $308,300 | Palos Heights School District 128 / 10,015 |
| 104. | $305,400 | Palos Community Consolidated School District 118 / 22,984 |
| 105. | $300,700 | Lincoln Way Community High School District 210 / 103,065 |
| 106. | $300,400 | Peotone Community Unit School District 207U / 11,003 |
| 107. | $300,000 | Maercker School District 60 / 18,075 |
| 108. | $299,100 | Elmwood Park Community Unit School District 401 / 24,710 |
| 109. | $298,900 | Kaneland Community Unit School District 302 / 25,110 |
| 110. | $298,200 | East Maine School District 63 / 45,409 |
| 111. | $297,500 | Prairie Grove Community School District 46 / 7,604 |
| 112. | $295,100 | Riverside Brookfield Township School District 208 / 28,767 |
| 113. | $294,300 | Township High School District 211 / 232,811 |
| 114. | $293,700 | New Lenox School District 122 / 38,008 |
| 115. | $289,800 | Cary Community Consolidated School District 26 / 22,076 |
| 116. | $285,700 | Huntley Consolidated School District 158 / 39,083 |
| 117. | $285,400 | LaGrange School District 105 / 12,064 |
| 118. | $283,600 | Lisle Community Unit School District 202 / 13,379 |
| 119. | $283,300 | Wood Dale School District 7 / 10,408 |
| 120. | $282,500 | Addison School District 4 / 37,158 |
| 121. | $281,200 | Woodland Community Consolidated School District 50 / 51,177 |
| 122. | $280,900 | Consolidated High School District 230 / 152,081 |
| 123. | $279,200 | Westchester School District 92-5 / 15,733 |
| 124. | $276,800 | Summit Hill School District 161 / 22,534 |
| 125. | $276,300 | Community Consolidated School District 59 / 65,516 |
| 126. | $275,400 | Fenton Community High School District 100 / 29,893 |
| 127. | $275,100 | Yorkville Community Unit School District 115 / 26,231 |
| 128. | $274,800 | DuPage High School District 88 / 81,353 |
| 128. | $274,800 | Rhodes School District 84-5 / 4,867 |
| 130. | $274,300 | Willow Springs School District 108 / 3,358 |
| 131. | $271,600 | Mundelein Consolidated High School District 120 / 41,133 |
| 132. | $271,400 | Warren Township High School District 121 / 67,701 |
| 133. | $270,600 | Des Plaines Community Consolidated School District 62 / 51,568 |
| 134. | $270,500 | Schiller Park School District 81 / 12,817 |
| 135. | $270,400 | Bensenville School District 2 / 19,485 |
| 135. | $270,400 | Brookfield School District 95 / 10,919 |
| 137. | $270,100 | Glenbard Township High School District 87 / 164,804 |
| 138. | $269,300 | Manhattan School District 114 / 9,151 |
| 139. | $269,200 | Chicago Public School District 299 / 2,703,477 |
| 140. | $268,900 | Hillside School District 93 / 5,047 |
| 140. | $268,900 | Community High School District 155 / 95,975 |
| 142. | $268,200 | Community High School District 94 / 40,762 |
| 143. | $267,700 | Kirby School District 140 / 34,807 |
| 144. | $265,900 | Schaumburg Community Consolidated School District 54 / 132,253 |
| 145. | $265,400 | Beecher Community Unit School District 200U / 6,242 |
| 146. | $264,700 | Fox River Grove Consolidated School District 3 / 4,336 |
| 147. | $263,300 | Community Consolidated School District 93 / 34,289 |
| 148. | $262,300 | Lombard School District 44 / 35,368 |
| 149. | $261,800 | Villa Park School District 45 / 35,059 |
| 150. | $258,100 | Crystal Lake Community Consolidated School District 47 / 61,959 |
| 151. | $257,000 | Lockport Township High School District 205 / 74,398 |
| 152. | $254,800 | Oswego Community Unit School District 308 / 68,241 |
| 153. | $254,400 | Wheeling Community Consolidated School District 21 / 65,346 |
| 154. | $249,300 | Diamond Lake School District 76 / 8,598 |
| 155. | $249,000 | Plainfield School District 202 / 112,788 |
| 156. | $248,100 | Mundelein Elementary School District 75 / 15,441 |
| 157. | $247,500 | Berwyn South School District 100 / 31,765 |
| 158. | $247,400 | Winfield School District 34 / 3,950 |
| 159. | $247,200 | Komarek School District 94 / 5,099 |
| 160. | $245,600 | West Chicago School District 33 / 30,575 |
| 161. | $245,400 | Community Unit School District 300 / 107,834 |
| 162. | $245,200 | Miller Township Community Consolidated School District / 2,298 |
| 163. | $244,400 | Keeneyville School District 20 / 13,914 |
| 164. | $243,800 | Gurnee School District 56 / 17,153 |
| 165. | $243,400 | North Palos School District 117 / 27,944 |
| 166. | $242,700 | Woodridge School District 68 / 32,135 |
| 167. | $241,500 | Channahon School District 17 / 10,195 |
| 168. | $241,200 | Hinckley-Big Rock Community Unit School District 429 / 4,836 |
| 169. | $240,700 | Leyden Community High School District 212 / 63,851 |
| 170. | $240,300 | Lisbon Community Consolidated School District 90 / 804 |
| 171. | $240,200 | Minooka Community High School District 111 / 35,370 |
| 172. | $239,400 | Queen Bee School District 16 / 17,414 |
| 173. | $239,300 | Minooka Community Consolidated School District 201 / 20,814 |
| 173. | $239,300 | Franklin Park School District 84 / 10,955 |
| 175. | $238,700 | Grayslake Consolidated Community School District 46 / 29,684 |
| 176. | $238,100 | Berwyn North School District 98 / 23,819 |
| 177. | $236,100 | Burbank School District 111 / 29,604 |
| 178. | $236,000 | School District U-46 / 227,274 |
| 179. | $235,900 | Reavis Township High School District 220 / 32,530 |
| 180. | $235,800 | Grayslake Community High School District 127 / 43,357 |
| 181. | $234,700 | Central Stickney School District 110 / 2,926 |
| 182. | $234,600 | Saratoga Community Consolidated School District 60C / 5,754 |
| 183. | $232,500 | Community Consolidated School District 146 / 25,948 |
| 184. | $232,100 | Wauconda Community Unit School District 118 / 26,822 |
| 185. | $229,300 | J. Sterling Morton High School District 201 / 157,034 |
| 186. | $229,000 | Somonauk Community Unit School District 432 / 4,889 |
| 187. | $228,900 | Mannheim School District 83 / 21,696 |
| 188. | $227,600 | Argo Community High School District 217 / 39,269 |
| 189. | $226,800 | Lyons School District 103 / 22,451 |
| 190. | $226,300 | Evergreen Park Community High School District 231 / 19,815 |
| 190. | $226,300 | Evergreen Park Elementary School District 124 / 19,815 |
| 192. | $226,000 | Flossmoor School District 161 / 22,229 |
| 193. | $225,600 | River Grove School District 85-5 / 7,764 |
| 194. | $225,500 | Indian Springs School District 109 / 23,923 |
| 195. | $225,400 | Newark Community High School District 18 / 3,320 |
| 196. | $224,500 | Forest Park School District 91 / 14,282 |
| 197. | $221,700 | Proviso Township High School District 209 / 126,153 |
| 198. | $221,500 | Ridgeland School District 122 / 21,095 |
| 199. | $220,300 | Oak Lawn-Hometown School District 123 / 34,784 |
| 200. | $219,800 | Cicero School District 99 / 83,332 |
| 201. | $219,600 | Summit School District 104 / 12,164 |
| 202. | $217,600 | Alsip-Hazelgreen-Oaklawn School District 126 / 17,235 |
| 203. | $217,400 | Lockport School District 91 / 6,655 |
| 204. | $217,100 | Arbor Park School District 145 / 12,424 |
| 205. | $216,400 | Richland School District 88A / 10,559 |
| 206. | $215,200 | Marquardt School District 15 / 26,435 |
| 206. | $215,200 | Newark Community Consolidated School District 66 / 2,235 |
| 208. | $214,400 | Valley View Community Unit School District 365U / 91,548 |
| 209. | $214,300 | Troy Community Consolidated School District 30C / 36,322 |
| 210. | $212,700 | Elwood Community Consolidated School District 203 / 3,243 |
| 211. | $211,700 | Berkeley School District 87 / 21,730 |
| 212. | $211,100 | Maywood-Melrose Park-Broadview School District 89 / 44,278 |
| 212. | $211,100 | St. George Community Consolidated School District 258 / 3,237 |
| 214. | $210,400 | Lake Central School Corporation / 64,470 |
| 215. | $209,200 | Morris Community High School District 101 / 18,658 |
| 216. | $208,500 | Sandwich Community Unit School District 430 / 14,462 |
| 217. | $207,200 | Community High School District 218 / 120,793 |
| 217. | $207,200 | Aurora West Unit School District 129 / 77,301 |
| 219. | $206,600 | Forest Ridge School District 142 / 17,479 |
| 220. | $206,400 | Hanover Community School Corporation / 11,539 |
| 221. | $203,300 | Grant Park Community Unit School District 6 / 3,382 |
| 222. | $203,000 | Sycamore Community Unit School District 427 / 21,820 |
| 223. | $202,400 | Homewood-Flossmoor Community High School District 233 / 38,387 |
| 223. | $202,400 | Oak Lawn Community High School District 229 / 38,679 |
| 225. | $201,900 | Lindop School District 92 / 4,110 |
| 226. | $200,000 | South Holland School District 150 / 10,074 |
| 226. | $200,000 | Worth School District 127 / 11,083 |
| 228. | $199,200 | Munster School Town / 23,254 |
| 229. | $198,600 | Taft School District 90 / 3,636 |
| 230. | $194,300 | Community Unit School District 2 / 5,639 |
| 231. | $193,000 | Elementary School District 159 / 18,755 |
| 231. | $193,000 | Morris School District 54 / 12,237 |
| 231. | $193,000 | Bellwood School District 88 / 23,181 |
| 234. | $192,700 | Fairmont School District 89 / 3,432 |
| 235. | $191,900 | Porter Township School Corporation / 9,261 |
| 236. | $191,200 | Crete-Monee Community Unit School District 201-U / 33,941 |
| 237. | $190,100 | Atwood Heights School District 125 / 7,014 |
| 238. | $189,000 | Union Township School Corporation / 8,737 |
| 239. | $188,400 | Sunnybrook School District 171 / 10,756 |
| 240. | $188,000 | Duneland School Corporation / 33,885 |
| 241. | $187,900 | Chicago Ridge School District 127-5 / 13,039 |
| 242. | $187,400 | Manteno Community Unit School District 5 / 12,119 |
| 243. | $185,900 | Homewood School District 153 / 15,669 |
| 244. | $184,300 | Bremen Community High School District 228 / 93,470 |
| 245. | $184,000 | Plano Community Unit School District 88 / 9,943 |
| 246. | $182,400 | East Porter County School Corporation / 12,428 |
| 246. | $182,400 | Crown Point Community School Corporation / 40,171 |
| 248. | $182,200 | Valparaiso Community Schools / 42,557 |
| 249. | $181,500 | Matteson Elementary School District 162 / 24,435 |
| 250. | $178,600 | Midlothian School District 143 / 14,884 |
| 251. | $177,300 | Bourbonnais School District 53 / 23,247 |
| 252. | $174,700 | Wilmington Community Unit School District 209U / 9,820 |
| 253. | $174,600 | Cook County School District 130 / 29,252 |
| 254. | $173,200 | Reed Custer Community Unit School District 255U / 9,316 |
| 255. | $172,700 | Seneca Township High School District 160 / 7,361 |
| 256. | $172,400 | Coal City Community Unit School District 1 / 11,258 |
| 257. | $170,500 | Joliet Township High School District 204 / 129,911 |
| 258. | $167,700 | Country Club Hills School District 160 / 12,204 |
| 259. | $166,900 | Mazon-Verona-Kinsman Elementary School District 2C / 2,782 |
| 260. | $166,000 | Tri-Creek School Corporation / 20,242 |
| 261. | $165,100 | Union School District 81 / 1,597 |
| 262. | $164,800 | Laraway Community Consolidated School District 70C / 3,393 |
| 263. | $164,700 | Herscher Community Unit School District 2 / 10,616 |
| 264. | $163,900 | Seneca Community Consolidated School District 170 / 3,659 |
| 265. | $162,400 | Rich Township High School District 227 / 67,082 |
| 266. | $162,000 | Bradley-Bourbonnais Consolidated High School District 307 / 38,851 |
| 267. | $161,700 | Aurora East Unit School District 131 / 77,437 |
| 268. | $160,000 | Round Lake Community Unit School District 116 / 35,961 |
| 269. | $159,400 | Waukegan Community Unit School District 60 / 84,428 |
| 270. | $158,300 | Brookwood School District 167 / 10,312 |
| 271. | $158,200 | Chaney-Monge School District 88 / 6,168 |
| 272. | $155,900 | Calumet City School District 155 / 11,022 |
| 273. | $154,800 | Highland School Town / 23,710 |
| 274. | $153,900 | Kankakee Valley School Corporation / 19,003 |
| 275. | $153,400 | South Holland School District 151 / 13,733 |
| 276. | $153,200 | Dolton School District 149 / 27,594 |
| 277. | $152,800 | Joliet Public School District 86 / 86,698 |
| 278. | $150,300 | Prairie-Hills Elementary School District 144 / 22,015 |
| 279. | $149,700 | Thornton Fractional Township High School District 215 / 59,426 |
| 279. | $149,700 | Boone Township Metropolitan School District / 6,140 |
| 281. | $149,400 | Gardner Community Consolidated School District 72C / 1,562 |
| 282. | $145,100 | Rockdale School District 84 / 2,132 |
| 283. | $144,300 | Lansing School District 158 / 22,671 |
| 284. | $143,200 | Calumet Public School District 132 / 11,474 |
| 285. | $142,800 | Thornton School District 154 / 2,883 |
| 286. | $141,800 | North Chicago School District 187 / 31,655 |
| 287. | $141,500 | Merrillville Community School / 46,282 |
| 288. | $140,300 | Lincoln Elementary School District 156 / 7,139 |
| 289. | $139,500 | Central Community Unit School District 4 / 6,939 |
| 290. | $139,400 | Thornton Township High School District 205 / 116,702 |
| 291. | $139,200 | Griffith Public Schools / 16,915 |
| 292. | $139,000 | Posen-Robbins Elementary School District 143-5 / 11,656 |
| 293. | $138,700 | Burnham School District 154-5 / 1,539 |
| 294. | $135,800 | Gardner-South Wilmington Township High School District / 3,793 |
| 295. | $134,700 | Steger School District 194 / 13,309 |
| 296. | $133,000 | Bloom Township High School District 206 / 64,197 |
| 297. | $132,300 | Chicago Heights School District 170 / 24,842 |
| 298. | $132,000 | Momence Community Unit School District 1 / 7,289 |
| 299. | $130,900 | Portage Township Schools / 46,765 |
| 300. | $129,700 | Hobart School City / 23,382 |
| 301. | $128,600 | South Wilmington Consolidated School District 74 / 786 |
| 302. | $128,200 | Dolton School District 148 / 23,169 |
| 303. | $124,500 | Braceville School District 75 / 1,452 |
| 304. | $122,600 | North Newton School Corporation / 9,016 |
| 305. | $121,500 | Bradley School District 61 / 12,367 |
| 306. | $121,300 | St. Anne Consolidated Community School District 256 / 2,769 |
| 307. | $120,900 | Whiting School City / 4,581 |
| 308. | $118,500 | Community Consolidated School District 168 / 10,243 |
| 309. | $118,300 | Hoover-Schrum Memorial School District 157 / 7,962 |
| 310. | $113,700 | Hazel Crest School District 152-5 / 8,161 |
| 311. | $109,800 | Kankakee School District 111 / 33,072 |
| 312. | $106,900 | Harvey School District 152 / 16,264 |
| 313. | $98,900 | St. Anne Community High School District 302 / 4,606 |
| 314. | $98,300 | Park Forest School District 163 / 15,864 |
| 315. | $97,700 | Hammond School City / 81,752 |
| 316. | $93,500 | West Harvey-Dixmoor Public School District 147 / 11,533 |
| 317. | $90,300 | Lake Station Community Schools / 8,207 |
| 318. | $89,500 | General George Patton School District 133 / 2,352 |
| 319. | $89,100 | City of East Chicago School District / 30,218 |
| 320. | $82,100 | Lake Ridge Schools / 13,104 |
| 321. | $78,300 | Ford Heights School District 169 / 2,858 |
| 322. | $75,700 | River Forest Community School Corporation / 8,057 |
| 323. | $69,500 | Gary Community School Corporation / 78,533 |
| 324. | $63,400 | Pembroke Consolidated Community School District 259 / 1,837 |
| 325. | $24,300 | Sandridge School District 172 / 4,410 |
Please note that we only rank locations with 'House Median Value' data. The rank above might not be a complete list. Locations without 'House Median Value' data are not listed.
*ACS stands for U.S. Census American Community Survey. According to the U.S. Census, if the date is a range, you can interpret the data as an average of the period of time.
