Local Data Search
A total of 373 results found. Show Results on Map.
| Rank | Median Household Income ▼ | City / Population |
| 1. | $224,643 | Kenilworth, IL / 2,524 |
| 2. | $207,955 | Winnetka, IL / 12,112 |
| 3. | $193,571 | Glencoe, IL / 8,628 |
| 4. | $191,250 | Bannockburn, IL / 1,369 |
| 5. | $176,833 | Kildeer, IL / 3,889 |
| 6. | $175,298 | South Barrington, IL / 4,385 |
| 7. | $171,979 | Riverwoods, IL / 3,920 |
| 8. | $167,083 | Hinsdale, IL / 16,633 |
| 9. | $163,000 | Golf, IL / 593 |
| 10. | $162,902 | Long Grove, IL / 7,866 |
| 11. | $160,625 | Hawthorn Woods, IL / 7,405 |
| 12. | $157,188 | Green Oaks, IL / 3,832 |
| 13. | $155,750 | Wayne, IL / 2,737 |
| 14. | $146,400 | Lake Bluff, IL / 6,035 |
| 15. | $146,118 | North Barrington, IL / 3,044 |
| 16. | $144,625 | Tower Lake, IL / 1,473 |
| 17. | $143,669 | Burr Ridge, IL / 10,505 |
| 18. | $143,041 | Lincolnshire, IL / 7,077 |
| 19. | $142,250 | Inverness, IL / 7,129 |
| 20. | $139,271 | Mettawa, IL / 597 |
| 21. | $138,500 | Bull Valley, IL / 1,156 |
| 22. | $136,801 | Lake Forest, IL / 19,397 |
| 23. | $135,917 | Barrington Hills, IL / 4,165 |
| 24. | $135,385 | Campton Hills, IL / 10,780 |
| 25. | $132,866 | Western Springs, IL / 12,657 |
| 26. | $131,719 | Oak Brook, IL / 7,905 |
| 27. | $131,534 | Deerfield, IL / 18,405 |
| 28. | $128,028 | Wilmette, IL / 26,928 |
| 29. | $127,750 | Deer Park, IL / 3,229 |
| 30. | $122,596 | Third Lake, IL / 1,503 |
| 31. | $117,439 | Lakewood, IL / 3,754 |
| 32. | $117,299 | Frankfort, IL / 17,056 |
| 33. | $116,528 | River Forest, IL / 11,166 |
| 34. | $113,089 | Northbrook, IL / 32,922 |
| 35. | $112,541 | Highland Park, IL / 30,080 |
| 36. | $111,964 | Wadsworth, IL / 3,859 |
| 37. | $111,944 | Indian Creek, IL / 533 |
| 38. | $111,753 | Clarendon Hills, IL / 8,275 |
| 39. | $110,703 | Lake Barrington, IL / 4,840 |
| 40. | $108,875 | Gilberts, IL / 5,866 |
| 41. | $107,279 | Northfield, IL / 5,429 |
| 42. | $107,045 | Prairie Grove, IL / 1,867 |
| 43. | $107,037 | Glenview, IL / 43,649 |
| 44. | $106,663 | Lake Zurich, IL / 19,554 |
| 45. | $105,897 | Plainfield, IL / 35,708 |
| 46. | $104,703 | Flossmoor, IL / 9,218 |
| 47. | $102,891 | Timberlane, IL / 1,052 |
| 48. | $102,721 | Spring Grove, IL / 5,214 |
| 49. | $102,493 | Libertyville, IL / 20,530 |
| 50. | $102,370 | Barrington, IL / 10,662 |
| 51. | $102,228 | Sugar Grove, IL / 8,202 |
| 52. | $101,911 | Naperville, IL / 140,838 |
| 53. | $101,650 | Port Barrington, IL / 1,746 |
| 54. | $100,625 | Trout Valley, IL / 507 |
| 55. | $99,637 | Mokena, IL / 18,164 |
| 56. | $98,897 | Grandwood Park, IL / 4,998 |
| 57. | $97,797 | Homer Glen, IL / 24,723 |
| 58. | $97,127 | Lindenhurst, IL / 14,227 |
| 59. | $96,894 | Cary, IL / 18,167 |
| 60. | $96,507 | Algonquin, IL / 29,407 |
| 61. | $96,444 | Lake Villa, IL / 8,460 |
| 62. | $96,071 | Kaneville, IL / 367 |
| 63. | $95,000 | Lily Lake, IL / 975 |
| 64. | $94,629 | La Grange, IL / 15,430 |
| 65. | $93,973 | Forest Lake, IL / 1,814 |
| 66. | $91,950 | Elburn, IL / 5,310 |
| 67. | $91,820 | Oswego, IL / 27,719 |
| 68. | $91,762 | Grayslake, IL / 20,671 |
| 69. | $91,731 | Winfield, IL / 9,041 |
| 70. | $91,581 | Geneva, IL / 21,448 |
| 71. | $90,820 | Glen Ellyn, IL / 27,397 |
| 72. | $90,371 | Bartlett, IL / 40,122 |
| 73. | $90,250 | Ringwood, IL / 849 |
| 74. | $89,309 | Lemont, IL / 15,320 |
| 75. | $89,095 | Shorewood, IL / 14,718 |
| 76. | $88,778 | New Lenox, IL / 23,946 |
| 77. | $88,333 | Greenwood, IL / 167 |
| 78. | $87,777 | Batavia, IL / 25,924 |
| 79. | $87,494 | Vernon Hills, IL / 24,388 |
| 80. | $87,218 | Antioch, IL / 13,519 |
| 81. | $87,054 | Buffalo Grove, IL / 41,859 |
| 82. | $86,875 | Riverside, IL / 8,737 |
| 83. | $86,229 | Wheaton, IL / 53,141 |
| 84. | $86,197 | Sleepy Hollow, IL / 3,412 |
| 85. | $85,909 | Knollwood, IL / 1,676 |
| 86. | $85,897 | Park Ridge, IL / 37,115 |
| 87. | $85,776 | Prestbury, IL / 1,814 |
| 88. | $85,726 | Gurnee, IL / 31,068 |
| 89. | $85,301 | Elmhurst, IL / 43,753 |
| 90. | $85,200 | Palos Park, IL / 4,785 |
| 91. | $85,092 | West Dundee, IL / 7,078 |
| 92. | $84,646 | Palos Heights, IL / 12,185 |
| 93. | $83,628 | Channahon, IL / 12,215 |
| 94. | $83,512 | Volo, IL / 1,859 |
| 95. | $83,257 | Frankfort Square, IL / 9,525 |
| 96. | $82,897 | Lake In The Hills, IL / 28,596 |
| 97. | $82,875 | Lincolnwood, IL / 12,422 |
| 98. | $82,759 | Mundelein, IL / 31,146 |
| 99. | $82,399 | Olympia Fields, IL / 4,718 |
| 100. | $82,007 | Yorkville, IL / 15,065 |
| 101. | $81,442 | Oakwood Hills, IL / 2,021 |
| 102. | $81,294 | Itasca, IL / 8,390 |
| 103. | $81,108 | Bolingbrook, IL / 72,649 |
| 104. | $80,879 | South Elgin, IL / 21,235 |
| 105. | $80,489 | Manhattan, IL / 6,511 |
| 106. | $80,325 | Minooka, IL / 9,522 |
| 107. | $80,313 | Lake Holiday, IL / 4,504 |
| 108. | $80,102 | Johnsburg, IL / 6,294 |
| 109. | $79,880 | Gages Lake, IL / 10,166 |
| 110. | $79,677 | Hainesville, IL / 3,330 |
| 111. | $79,583 | North Aurora, IL / 15,680 |
| 111. | $79,583 | Orland Park, IL / 55,098 |
| 113. | $79,096 | Lockport, IL / 23,844 |
| 114. | $79,000 | Big Rock, IL / 1,151 |
| 115. | $78,523 | Downers Grove, IL / 47,938 |
| 116. | $78,125 | Wonder Lake, IL / 3,562 |
| 117. | $77,619 | Lisle, IL / 22,288 |
| 118. | $77,324 | Saint Charles, IL / 32,392 |
| 119. | $77,297 | Willow Springs, IL / 5,344 |
| 120. | $77,207 | Roselle, IL / 22,733 |
| 121. | $77,127 | Fox River Grove, IL / 5,080 |
| 122. | $76,605 | Tinley Park, IL / 54,943 |
| 123. | $76,458 | Warrenville, IL / 13,214 |
| 124. | $76,294 | Round Lake, IL / 16,163 |
| 125. | $76,054 | Darien, IL / 22,163 |
| 126. | $75,625 | Dayton, IL / 634 |
| 127. | $75,506 | Hoffman Estates, IL / 51,203 |
| 128. | $75,369 | Lakemoor, IL / 5,765 |
| 129. | $75,257 | Arlington Heights, IL / 74,967 |
| 130. | $75,021 | Crystal Lake, IL / 41,044 |
| 131. | $74,965 | Winthrop Harbor, IL / 6,791 |
| 132. | $74,750 | Fontana-On-Geneva Lake Village, WI / 1,646 |
| 133. | $74,231 | Crystal Lawns, IL / 2,001 |
| 134. | $74,167 | Elwood, IL / 2,429 |
| 135. | $74,148 | Pingree Grove, IL / 3,780 |
| 136. | $74,060 | Palatine, IL / 67,414 |
| 137. | $74,000 | Millbrook, IL / 228 |
| 138. | $73,390 | La Grange Park, IL / 13,387 |
| 139. | $73,289 | Holiday Hills, IL / 674 |
| 140. | $73,068 | Oak Park, IL / 51,426 |
| 141. | $72,938 | Hampshire, IL / 5,101 |
| 142. | $72,596 | Kingston, IL / 1,129 |
| 143. | $72,489 | Pleasant Prairie, WI / 19,124 |
| 144. | $71,875 | Virgil, IL / 363 |
| 145. | $71,544 | Carol Stream, IL / 39,740 |
| 146. | $71,474 | Lombard, IL / 42,722 |
| 147. | $71,332 | Woodridge, IL / 32,475 |
| 148. | $71,280 | Oak Forest, IL / 27,685 |
| 149. | $71,195 | Homewood, IL / 19,328 |
| 150. | $71,071 | Cortland, IL / 3,803 |
| 151. | $71,000 | Island Lake, IL / 8,223 |
| 152. | $70,859 | Morton Grove, IL / 22,868 |
| 153. | $70,674 | Fox Lake Hills, IL / 2,461 |
| 154. | $70,625 | Old Mill Creek, IL / 142 |
| 155. | $70,526 | Huntley, IL / 21,261 |
| 156. | $70,272 | Orland Hills, IL / 7,011 |
| 157. | $70,000 | Caledonia, IL / 215 |
| 158. | $69,926 | Powers Lake, WI / 1,427 |
| 159. | $69,875 | Highwood, IL / 5,452 |
| 160. | $69,710 | Streamwood, IL / 39,267 |
| 161. | $69,679 | Westchester, IL / 16,542 |
| 162. | $69,534 | Monee, IL / 4,916 |
| 163. | $69,275 | Indian Head Park, IL / 3,795 |
| 164. | $69,235 | Elk Grove Village, IL / 33,072 |
| 165. | $69,081 | Bloomingdale, IL / 21,877 |
| 166. | $68,916 | Wauconda, IL / 13,009 |
| 167. | $68,895 | Montgomery, IL / 15,957 |
| 168. | $68,594 | Beach Park, IL / 13,315 |
| 169. | $68,424 | Boulder Hill, IL / 8,641 |
| 170. | $68,107 | Evanston, IL / 73,880 |
| 171. | $67,882 | Mount Prospect, IL / 53,838 |
| 172. | $67,530 | Roscoe, IL / 10,164 |
| 173. | $67,260 | East Dundee, IL / 2,928 |
| 174. | $67,165 | Romeoville, IL / 37,484 |
| 175. | $66,863 | Brookfield, IL / 18,807 |
| 176. | $66,822 | Villa Park, IL / 22,249 |
| 177. | $66,818 | Hinckley, IL / 2,154 |
| 178. | $66,794 | Bristol, WI / 2,563 |
| 179. | $66,745 | Matteson, IL / 17,756 |
| 180. | $66,741 | Schaumburg, IL / 73,333 |
| 181. | $66,655 | Skokie, IL / 63,824 |
| 182. | $66,359 | Sycamore, IL / 16,800 |
| 183. | $66,250 | Lakewood Shores, IL / 1,465 |
| 184. | $66,023 | Monroe Center, IL / 560 |
| 185. | $65,701 | Mchenry, IL / 26,518 |
| 186. | $65,133 | Venetian Village, IL / 3,060 |
| 187. | $64,896 | Round Lake Heights, IL / 2,865 |
| 188. | $64,886 | Waterman, IL / 1,394 |
| 189. | $64,795 | West Chicago, IL / 26,348 |
| 190. | $64,732 | Paddock Lake, WI / 3,020 |
| 191. | $64,653 | Creston, IL / 781 |
| 192. | $63,649 | Hanover Park, IL / 37,743 |
| 193. | $63,646 | Mazon, IL / 887 |
| 194. | $63,490 | Glendale Heights, IL / 33,664 |
| 195. | $63,125 | Newark, IL / 898 |
| 196. | $63,012 | Wood Dale, IL / 13,678 |
| 197. | $62,986 | Countryside, IL / 5,817 |
| 198. | $62,955 | Mccook, IL / 365 |
| 198. | $62,955 | Braidwood, IL / 5,965 |
| 200. | $62,837 | Evergreen Park, IL / 19,815 |
| 201. | $62,709 | Round Lake Beach, IL / 28,006 |
| 202. | $62,470 | Twin Lakes, WI / 5,901 |
| 203. | $62,404 | Bedford Park, IL / 574 |
| 204. | $62,200 | Delavan Lake, WI / 2,771 |
| 205. | $62,180 | Hickory Hills, IL / 14,004 |
| 206. | $62,059 | Maple Park, IL / 1,474 |
| 207. | $61,694 | Davis Junction, IL / 2,189 |
| 208. | $61,563 | Lisbon, IL / 292 |
| 209. | $61,536 | Pistakee Highlands, IL / 3,455 |
| 210. | $61,525 | Coal City, IL / 5,428 |
| 211. | $61,287 | Addison, IL / 36,670 |
| 212. | $61,250 | Richmond, IL / 1,954 |
| 213. | $60,875 | Des Plaines, IL / 57,357 |
| 214. | $60,714 | Joliet, IL / 145,002 |
| 215. | $60,694 | Genoa, IL / 5,529 |
| 216. | $60,689 | Aurora, IL / 190,437 |
| 217. | $60,644 | South Holland, IL / 21,880 |
| 218. | $60,587 | Lake Shangrila, WI / 679 |
| 219. | $60,430 | Somonauk, IL / 2,007 |
| 220. | $60,081 | Genoa City, WI / 2,888 |
| 221. | $60,063 | Willowbrook, IL / 8,546 |
| 222. | $60,023 | Seneca, IL / 2,407 |
| 223. | $59,974 | Westmont, IL / 24,494 |
| 224. | $59,739 | Midlothian, IL / 14,581 |
| 225. | $59,623 | Rolling Meadows, IL / 23,601 |
| 226. | $59,583 | Braceville, IL / 858 |
| 227. | $59,570 | Poplar Grove, IL / 5,084 |
| 228. | $59,551 | Country Club Hills, IL / 16,286 |
| 229. | $59,435 | Channel Lake, IL / 1,793 |
| 230. | $59,096 | Hillcrest, IL / 1,292 |
| 231. | $59,050 | Oak Lawn, IL / 55,830 |
| 232. | $59,010 | Burlington, IL / 535 |
| 233. | $58,814 | Oakbrook Terrace, IL / 2,224 |
| 234. | $58,750 | Chemung, IL / 225 |
| 234. | $58,750 | Bohners Lake, WI / 2,428 |
| 236. | $58,681 | Morris, IL / 13,533 |
| 237. | $58,636 | New Milford, IL / 732 |
| 238. | $58,589 | Springfield, WI / 107 |
| 239. | $58,261 | Sheridan, IL / 1,158 |
| 240. | $58,132 | Plano, IL / 9,472 |
| 241. | $58,113 | Glenwood, IL / 8,731 |
| 242. | $58,056 | Paw Paw, IL / 849 |
| 243. | $57,955 | Cherry Valley, IL / 3,271 |
| 244. | $57,895 | Forest View, IL / 834 |
| 245. | $57,723 | Bellwood, IL / 19,114 |
| 246. | $57,632 | Lee, IL / 390 |
| 247. | $57,610 | Sandwich, IL / 7,707 |
| 248. | $57,539 | Williams Bay, WI / 2,567 |
| 249. | $57,518 | Hillside, IL / 8,088 |
| 250. | $57,500 | Millington, IL / 878 |
| 251. | $57,264 | Palos Hills, IL / 17,366 |
| 252. | $57,260 | Prospect Heights, IL / 16,252 |
| 253. | $57,216 | Elgin, IL / 106,837 |
| 254. | $57,153 | Thornton, IL / 2,452 |
| 255. | $57,120 | Woodstock, IL / 24,414 |
| 256. | $57,083 | Plattville, IL / 152 |
| 257. | $57,031 | Kirkland, IL / 1,647 |
| 258. | $56,946 | Lynwood, IL / 8,725 |
| 259. | $56,786 | Union, IL / 683 |
| 260. | $56,713 | Marengo, IL / 7,881 |
| 261. | $56,406 | Diamond, IL / 2,461 |
| 262. | $56,386 | Burbank, IL / 28,427 |
| 263. | $56,250 | Darien, WI / 1,430 |
| 263. | $56,250 | Stillman Valley, IL / 1,099 |
| 265. | $56,136 | Fox Lake, IL / 10,515 |
| 266. | $56,027 | Lily Lake, WI / 553 |
| 267. | $55,869 | Wheeling, IL / 37,030 |
| 268. | $55,625 | Symerton, IL / 94 |
| 269. | $55,324 | Carpentersville, IL / 37,094 |
| 270. | $55,100 | Elmwood Park, IL / 24,710 |
| 271. | $54,683 | Wilmington, IL / 5,712 |
| 272. | $54,676 | Richton Park, IL / 13,327 |
| 273. | $54,437 | Franklin Park, IL / 18,346 |
| 274. | $54,422 | Machesney Park, IL / 23,070 |
| 275. | $54,054 | Harwood Heights, IL / 8,462 |
| 276. | $53,955 | Berkeley, IL / 5,159 |
| 277. | $53,929 | Camp Lake, WI / 3,426 |
| 278. | $53,897 | Stone Park, IL / 4,930 |
| 279. | $53,889 | Como, WI / 2,835 |
| 280. | $53,125 | Mccullom Lake, IL / 1,209 |
| 281. | $53,042 | Lyons, IL / 10,530 |
| 282. | $52,978 | Crest Hill, IL / 20,313 |
| 283. | $52,920 | Hazel Crest, IL / 14,271 |
| 284. | $52,904 | Crestwood, IL / 10,922 |
| 285. | $52,833 | Silver Lake, WI / 2,418 |
| 286. | $52,576 | Northlake, IL / 12,156 |
| 287. | $52,500 | Bensenville, IL / 18,661 |
| 288. | $52,159 | East Hazel Crest, IL / 1,715 |
| 289. | $51,908 | Sauk Village, IL / 10,360 |
| 290. | $51,906 | Norridge, IL / 14,414 |
| 291. | $51,780 | Forest Park, IL / 14,282 |
| 292. | $51,693 | Long Lake, IL / 3,063 |
| 293. | $51,424 | Alsip, IL / 19,134 |
| 294. | $51,313 | Posen, IL / 5,684 |
| 295. | $51,250 | Steward, IL / 232 |
| 296. | $51,176 | Malta, IL / 823 |
| 297. | $51,090 | Dolton, IL / 23,324 |
| 298. | $50,874 | Zion, IL / 24,375 |
| 299. | $50,829 | Niles, IL / 29,463 |
| 300. | $50,577 | Pell Lake, WI / 3,420 |
| 301. | $50,563 | Lansing, IL / 28,005 |
| 302. | $50,505 | Walworth, WI / 2,765 |
| 303. | $50,488 | Justice, IL / 12,633 |
| 304. | $49,783 | Stickney, IL / 6,608 |
| 305. | $49,524 | River Grove, IL / 10,200 |
| 306. | $49,503 | Loves Park, IL / 23,723 |
| 307. | $49,375 | West Brooklyn, IL / 122 |
| 307. | $49,375 | Wilmot, WI / 448 |
| 309. | $49,310 | North Riverside, IL / 6,660 |
| 310. | $49,278 | Mendota, IL / 7,274 |
| 311. | $48,750 | Summit, IL / 10,865 |
| 312. | $48,720 | Schiller Park, IL / 11,668 |
| 313. | $48,710 | Capron, IL / 1,369 |
| 313. | $48,710 | Berwyn, IL / 55,584 |
| 315. | $48,291 | Park Forest, IL / 22,330 |
| 316. | $48,071 | Chicago Ridge, IL / 14,145 |
| 317. | $47,987 | Waukegan, IL / 89,382 |
| 318. | $47,873 | Lake Geneva, WI / 7,685 |
| 319. | $47,722 | Broadview, IL / 7,924 |
| 320. | $47,500 | Leland, IL / 777 |
| 321. | $47,214 | Hometown, IL / 4,324 |
| 322. | $46,904 | Worth, IL / 10,677 |
| 323. | $46,877 | Chicago, IL / 2,703,466 |
| 324. | $46,845 | Calumet Park, IL / 7,932 |
| 325. | $46,597 | Earlville, IL / 1,728 |
| 326. | $46,580 | Belvidere, IL / 25,303 |
| 327. | $46,556 | Ottawa, IL / 19,263 |
| 328. | $46,375 | Marseilles, IL / 5,159 |
| 329. | $46,266 | Ingalls Park, IL / 3,684 |
| 330. | $46,250 | Compton, IL / 292 |
| 331. | $46,082 | University Park, IL / 7,329 |
| 332. | $45,991 | Harvard, IL / 8,621 |
| 333. | $45,865 | Hebron, IL / 1,078 |
| 334. | $45,818 | Maywood, IL / 24,338 |
| 335. | $45,109 | Round Lake Park, IL / 7,232 |
| 336. | $45,035 | Rochelle, IL / 9,597 |
| 337. | $45,000 | Rockdale, IL / 1,954 |
| 338. | $44,904 | North Chicago, IL / 33,010 |
| 339. | $44,877 | Bridgeview, IL / 16,144 |
| 340. | $44,766 | South Chicago Heights, IL / 4,073 |
| 341. | $44,375 | Godley, IL / 860 |
| 342. | $44,286 | Fairmont, IL / 2,044 |
| 343. | $44,243 | Preston Heights, IL / 2,793 |
| 344. | $44,148 | Shabbona, IL / 1,194 |
| 345. | $44,079 | Steger, IL / 9,734 |
| 346. | $43,929 | Carbon Hill, IL / 442 |
| 347. | $43,851 | Calumet City, IL / 36,975 |
| 348. | $43,799 | Cicero, IL / 83,332 |
| 349. | $43,478 | Melrose Park, IL / 24,725 |
| 350. | $43,335 | Blue Island, IL / 22,990 |
| 351. | $43,333 | Markham, IL / 12,408 |
| 352. | $43,162 | Ashton, IL / 977 |
| 353. | $42,690 | Riverdale, IL / 13,629 |
| 354. | $42,290 | Whiting, IN / 5,021 |
| 355. | $41,947 | Park City, IL / 7,600 |
| 356. | $41,385 | Merrionette Park, IL / 2,247 |
| 357. | $41,350 | Sharon, WI / 1,474 |
| 358. | $40,804 | Lake Ivanhoe, WI / 488 |
| 359. | $40,228 | Dekalb, IL / 43,995 |
| 360. | $39,893 | Lake Catherine, IL / 1,084 |
| 361. | $38,972 | Chicago Heights, IL / 30,414 |
| 362. | $38,817 | Dixmoor, IL / 3,663 |
| 363. | $38,715 | Burnham, IL / 4,188 |
| 364. | $38,573 | Rockford, IL / 154,517 |
| 365. | $38,539 | Hammond, IN / 81,312 |
| 366. | $37,941 | Hodgkins, IL / 2,440 |
| 367. | $35,903 | Garden Prairie, IL / 185 |
| 368. | $32,923 | Harvey, IL / 25,489 |
| 369. | $32,396 | Rosemont, IL / 3,985 |
| 370. | $31,707 | Phoenix, IL / 2,131 |
| 371. | $28,999 | East Chicago, IN / 30,218 |
| 372. | $22,481 | Robbins, IL / 5,282 |
| 373. | $21,916 | Ford Heights, IL / 2,858 |
Please note that we only rank locations with 'Median Household Income' data. The rank above might not be a complete list. Locations without 'Median Household Income' 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.