Local Data Search
A total of 377 results found. Show Results on Map. The education index is an indicator of the average education level of the population. A higher education index value means more educated population.
| Rank | Average Education Index ▼ | City / Population |
| 1. | 17.93 | Chevy Chase Section Five, MD / 735 |
| 2. | 17.30 | Martins Additions, MD / 904 |
| 3. | 17.19 | North Chevy Chase, MD / 560 |
| 4. | 17.03 | University Park, MD / 2,528 |
| 5. | 16.97 | Garrett Park, MD / 917 |
| 6. | 16.83 | Chevy Chase CDP, MD / 9,741 |
| 7. | 16.82 | Chevy Chase View, MD / 1,010 |
| 8. | 16.74 | Woodmore, MD / 3,501 |
| 9. | 16.68 | Brookeville, MD / 165 |
| 10. | 16.66 | Highland, MD / 679 |
| 11. | 16.55 | Highland Beach, MD / 73 |
| 12. | 16.53 | Greenville, DE / 2,453 |
| 13. | 16.47 | South Kensington, MD / 8,149 |
| 14. | 16.31 | Washington Grove, MD / 445 |
| 15. | 16.29 | Naval Academy, MD / 4,168 |
| 16. | 16.07 | Kensington, MD / 1,858 |
| 17. | 16.01 | North Bethesda, MD / 40,489 |
| 18. | 16.00 | Hampton, MD / 4,888 |
| 19. | 15.90 | Mays Chapel, MD / 11,965 |
| 20. | 15.71 | Derwood, MD / 2,136 |
| 21. | 15.70 | Fulton, MD / 1,966 |
| 22. | 15.70 | Ellicott City, MD / 64,970 |
| 23. | 15.64 | North Star, DE / 7,929 |
| 24. | 15.62 | Hockessin, DE / 12,919 |
| 25. | 15.58 | Olney, MD / 33,167 |
| 26. | 15.52 | Towson, MD / 54,068 |
| 27. | 15.51 | Columbia, MD / 98,379 |
| 28. | 15.50 | Ashton-Sandy Spring, MD / 5,350 |
| 29. | 15.48 | Ilchester, MD / 22,907 |
| 30. | 15.43 | Rockville, MD / 58,300 |
| 31. | 15.40 | Garrison, MD / 7,622 |
| 32. | 15.37 | Fairwood, MD / 4,650 |
| 33. | 15.36 | North Laurel, MD / 4,076 |
| 34. | 15.34 | Kemp Mill, MD / 12,084 |
| 35. | 15.31 | Pikesville, MD / 30,720 |
| 36. | 15.31 | Grantley, PA / 3,492 |
| 37. | 15.31 | Lutherville, MD / 6,227 |
| 38. | 15.24 | Four Corners, MD / 7,998 |
| 39. | 15.24 | Cloverly, MD / 15,413 |
| 40. | 15.21 | Pike Creek, DE / 8,025 |
| 41. | 15.20 | Herald Harbor, MD / 2,244 |
| 42. | 15.20 | Annapolis Neck, MD / 11,105 |
| 43. | 15.19 | Forest Glen, MD / 6,182 |
| 44. | 15.14 | Colesville, MD / 14,198 |
| 45. | 15.14 | Newark, DE / 31,110 |
| 46. | 15.14 | Arnold, MD / 22,483 |
| 47. | 15.12 | Takoma Park, MD / 16,853 |
| 48. | 15.11 | Crofton, MD / 27,624 |
| 49. | 15.10 | Layhill, MD / 5,678 |
| 50. | 15.08 | Tolchester, MD / 457 |
| 51. | 15.07 | Timonium, MD / 9,773 |
| 52. | 15.07 | Parole, MD / 14,894 |
| 53. | 15.04 | Konterra, MD / 2,168 |
| 54. | 15.02 | Severna Park, MD / 37,079 |
| 55. | 14.97 | Lake Arbor, MD / 10,309 |
| 56. | 14.94 | Scaggsville, MD / 22,995 |
| 57. | 14.87 | Mitchellville, MD / 11,653 |
| 58. | 14.87 | Hartly, DE / 143 |
| 59. | 14.83 | New Market, MD / 555 |
| 60. | 14.80 | Pike Creek Valley, DE / 11,400 |
| 61. | 14.80 | Bowie, MD / 54,314 |
| 62. | 14.79 | Spencerville, MD / 1,494 |
| 63. | 14.79 | Riva, MD / 3,927 |
| 64. | 14.79 | Laytonsville, MD / 290 |
| 65. | 14.78 | Upper Marlboro, MD / 739 |
| 66. | 14.77 | Montgomery Village, MD / 31,714 |
| 67. | 14.75 | Brock Hall, MD / 8,153 |
| 68. | 14.71 | Odenton, MD / 35,399 |
| 69. | 14.70 | Owings Mills, MD / 29,734 |
| 70. | 14.69 | Cape Saint Claire, MD / 8,670 |
| 71. | 14.68 | Fairland, MD / 23,086 |
| 72. | 14.67 | Calverton, MD / 17,800 |
| 73. | 14.65 | Damascus, MD / 15,520 |
| 74. | 14.64 | Cockeysville, MD / 19,842 |
| 75. | 14.63 | Maryland City, MD / 15,420 |
| 76. | 14.61 | Glenn Dale, MD / 14,129 |
| 77. | 14.59 | Redland, MD / 16,938 |
| 78. | 14.57 | Queenland, MD / 2,135 |
| 79. | 14.56 | Greenbelt, MD / 22,817 |
| 80. | 14.52 | Landisville, PA / 1,914 |
| 81. | 14.51 | Cheverly, MD / 6,234 |
| 82. | 14.50 | Savage, MD / 6,789 |
| 83. | 14.50 | Kent Narrows, MD / 589 |
| 84. | 14.50 | College Park, MD / 29,596 |
| 85. | 14.50 | Largo, MD / 11,012 |
| 86. | 14.50 | Silver Spring, MD / 70,049 |
| 87. | 14.48 | Bel Air North, MD / 29,172 |
| 88. | 14.46 | Burtonsville, MD / 9,233 |
| 89. | 14.46 | White Marsh, MD / 9,520 |
| 90. | 14.45 | Stonybrook, PA / 2,117 |
| 91. | 14.43 | Fort Meade, MD / 10,910 |
| 92. | 14.42 | North Kensington, MD / 9,623 |
| 93. | 14.42 | Glenmont, MD / 13,458 |
| 94. | 14.42 | Leisure World, MD / 8,666 |
| 95. | 14.40 | Fallston, MD / 8,062 |
| 96. | 14.39 | Kettering, MD / 12,545 |
| 97. | 14.35 | Eldersburg, MD / 31,632 |
| 98. | 14.34 | Bel Air South, MD / 45,769 |
| 99. | 14.33 | Catonsville, MD / 41,866 |
| 100. | 14.30 | Mayo, MD / 7,776 |
| 101. | 14.30 | Galesville, MD / 498 |
| 102. | 14.29 | Pylesville, MD / 588 |
| 103. | 14.29 | Arden On The Severn, MD / 1,921 |
| 104. | 14.25 | Hillandale, MD / 6,405 |
| 105. | 14.25 | Gambrills, MD / 2,575 |
| 106. | 14.22 | Riverside, MD / 6,543 |
| 107. | 14.21 | Glasgow, DE / 15,648 |
| 108. | 14.20 | Aberdeen Proving Ground, MD / 3,558 |
| 109. | 14.20 | Annapolis, MD / 37,825 |
| 110. | 14.18 | Mount Airy, MD / 8,921 |
| 111. | 14.16 | Odessa, DE / 227 |
| 112. | 14.15 | Perry Hall, MD / 28,368 |
| 113. | 14.14 | Springdale, MD / 2,522 |
| 114. | 14.13 | Marlboro Village, MD / 9,365 |
| 115. | 14.13 | Elkridge, MD / 13,512 |
| 116. | 14.11 | Libertytown, MD / 745 |
| 117. | 14.10 | White Oak, MD / 16,659 |
| 118. | 14.09 | New Freedom, PA / 4,316 |
| 119. | 14.09 | Darlington, MD / 449 |
| 120. | 14.08 | Saint Michaels, MD / 1,093 |
| 121. | 14.05 | Deale, MD / 4,934 |
| 122. | 14.03 | Jarrettsville, MD / 3,152 |
| 123. | 14.03 | West Laurel, MD / 4,741 |
| 124. | 14.02 | Aspen Hill, MD / 47,023 |
| 125. | 14.02 | Edgewater, MD / 8,692 |
| 126. | 14.01 | South Laurel, MD / 25,742 |
| 127. | 14.01 | Camden, DE / 3,244 |
| 128. | 14.00 | Chestertown, MD / 5,162 |
| 129. | 13.99 | Severn, MD / 41,753 |
| 130. | 13.99 | Valley View CDP, PA / 2,948 |
| 131. | 13.98 | Randallstown, MD / 32,570 |
| 132. | 13.97 | Kingsville, MD / 4,690 |
| 133. | 13.97 | Bel Air town, MD / 10,167 |
| 134. | 13.96 | Carney, MD / 27,583 |
| 135. | 13.95 | Kingstown, MD / 1,811 |
| 136. | 13.93 | Laurel, MD / 24,433 |
| 137. | 13.92 | Berwyn Heights, MD / 3,102 |
| 138. | 13.91 | Crownsville, MD / 1,926 |
| 139. | 13.91 | Stevensville, MD / 6,813 |
| 140. | 13.90 | Chester, MD / 4,142 |
| 141. | 13.88 | Middletown, DE / 16,648 |
| 142. | 13.86 | Easton, MD / 15,310 |
| 143. | 13.84 | Reisterstown, MD / 26,947 |
| 144. | 13.83 | Railroad, PA / 247 |
| 145. | 13.81 | Tyler Run, PA / 1,530 |
| 146. | 13.80 | Shrewsbury, PA / 3,784 |
| 147. | 13.79 | Rossville, MD / 15,072 |
| 148. | 13.79 | Rheems, PA / 1,313 |
| 149. | 13.78 | Willow Street, PA / 7,354 |
| 150. | 13.78 | East York, PA / 9,212 |
| 151. | 13.78 | Pleasant Hills, MD / 3,561 |
| 152. | 13.77 | Kennedyville, MD / 158 |
| 153. | 13.74 | Woodlawn, MD / 37,978 |
| 154. | 13.73 | Marlboro Meadows, MD / 3,631 |
| 155. | 13.71 | New Castle, DE / 5,250 |
| 156. | 13.70 | Salunga, PA / 2,905 |
| 157. | 13.70 | Conestoga, PA / 1,439 |
| 158. | 13.69 | Shady Side, MD / 5,885 |
| 159. | 13.68 | Havre De Grace, MD / 12,792 |
| 160. | 13.68 | Rothsville, PA / 3,125 |
| 161. | 13.68 | Soudersburg, PA / 527 |
| 162. | 13.67 | Lake Shore, MD / 18,880 |
| 163. | 13.67 | Wyoming, DE / 1,451 |
| 164. | 13.66 | Spry, PA / 4,907 |
| 165. | 13.65 | Centreville, MD / 3,937 |
| 166. | 13.64 | Summerfield, MD / 11,134 |
| 167. | 13.63 | Hampstead, MD / 6,203 |
| 168. | 13.60 | Westphalia, MD / 6,095 |
| 169. | 13.56 | Sykesville, MD / 4,454 |
| 170. | 13.52 | Beltsville, MD / 15,444 |
| 171. | 13.51 | Queen Anne, MD / 1,132 |
| 172. | 13.51 | Dover, DE / 35,474 |
| 173. | 13.48 | New Windsor, MD / 1,398 |
| 174. | 13.47 | Seabrook, MD / 15,620 |
| 175. | 13.46 | Hallam, PA / 2,492 |
| 176. | 13.45 | Milford Mill, MD / 28,767 |
| 177. | 13.45 | Lochearn, MD / 25,720 |
| 178. | 13.41 | Lanham, MD / 8,931 |
| 179. | 13.41 | Queenstown, MD / 690 |
| 180. | 13.41 | Joppatowne, MD / 12,662 |
| 181. | 13.40 | Arbutus, MD / 20,406 |
| 182. | 13.38 | Linthicum, MD / 10,444 |
| 183. | 13.38 | Millersville, PA / 8,077 |
| 184. | 13.38 | Galena, MD / 603 |
| 185. | 13.38 | Lititz, PA / 9,298 |
| 186. | 13.37 | Betterton, MD / 450 |
| 187. | 13.37 | Chesapeake City, MD / 719 |
| 188. | 13.37 | North East, MD / 3,492 |
| 189. | 13.37 | Manchester, MD / 4,597 |
| 190. | 13.37 | Shiloh, PA / 11,375 |
| 191. | 13.35 | East Petersburg, PA / 4,506 |
| 192. | 13.34 | Caln, PA / 1,123 |
| 193. | 13.34 | Strasburg, PA / 2,818 |
| 194. | 13.34 | Stewartstown, PA / 2,191 |
| 195. | 13.33 | Smoketown, PA / 377 |
| 196. | 13.32 | Kent Acres, DE / 1,989 |
| 197. | 13.32 | Overlea, MD / 12,672 |
| 198. | 13.32 | South Coatesville, PA / 1,359 |
| 199. | 13.30 | Taneytown, MD / 6,566 |
| 200. | 13.30 | Pasadena, MD / 22,189 |
| 201. | 13.30 | Mountville, PA / 2,734 |
| 202. | 13.30 | Cross Roads, PA / 620 |
| 203. | 13.27 | Lincoln University, PA / 1,934 |
| 204. | 13.27 | Westminster, MD / 18,591 |
| 205. | 13.25 | Parkville, MD / 30,156 |
| 206. | 13.23 | Clayton, DE / 2,638 |
| 207. | 13.21 | Jacobus, PA / 1,789 |
| 208. | 13.21 | Riviera Beach, MD / 11,813 |
| 209. | 13.20 | Rock Hall, MD / 1,243 |
| 210. | 13.19 | Bear, DE / 18,748 |
| 211. | 13.18 | Townsend, DE / 1,426 |
| 212. | 13.13 | Church Hill, MD / 551 |
| 213. | 13.12 | Grasonville, MD / 3,114 |
| 214. | 13.12 | Queens Gate, PA / 1,632 |
| 215. | 13.12 | Atglen, PA / 1,296 |
| 216. | 13.11 | Walker Mill, MD / 11,575 |
| 217. | 13.09 | New Salem borough, PA / 604 |
| 218. | 13.08 | Akron, PA / 3,909 |
| 219. | 13.08 | Adelphi, MD / 15,040 |
| 220. | 13.08 | Parkesburg, PA / 3,582 |
| 221. | 13.08 | Edgewood, MD / 25,391 |
| 222. | 13.08 | Glenarden, MD / 6,069 |
| 223. | 13.07 | Smyrna, DE / 9,330 |
| 224. | 13.07 | Red Lion, PA / 6,384 |
| 225. | 13.06 | Mount Joy, PA / 7,310 |
| 226. | 13.06 | Brookside, DE / 14,365 |
| 227. | 13.06 | Wheaton, MD / 45,079 |
| 228. | 13.05 | Port Deposit, MD / 621 |
| 229. | 13.02 | New Holland, PA / 5,343 |
| 230. | 13.02 | Wilmington, DE / 71,437 |
| 231. | 13.02 | Glen Rock, PA / 2,005 |
| 232. | 13.01 | Bowleys Quarters, MD / 6,607 |
| 233. | 13.00 | Pennsville, NJ / 11,922 |
| 234. | 12.99 | Charlestown, MD / 1,119 |
| 235. | 12.99 | District Heights, MD / 5,858 |
| 236. | 12.98 | Rosedale, MD / 19,044 |
| 237. | 12.98 | Cochranville, PA / 735 |
| 238. | 12.96 | Woodside, DE / 198 |
| 239. | 12.96 | Perryville, MD / 4,311 |
| 240. | 12.93 | Lampeter, PA / 1,541 |
| 241. | 12.92 | Perryman, MD / 2,343 |
| 242. | 12.91 | Forestville, MD / 12,297 |
| 243. | 12.91 | Baltimore, MD / 620,538 |
| 244. | 12.91 | Hyattsville, MD / 17,254 |
| 245. | 12.89 | Queen Anne town, MD / 243 |
| 246. | 12.89 | Glen Burnie, MD / 65,523 |
| 247. | 12.88 | Aberdeen, MD / 14,920 |
| 248. | 12.88 | Mount Wolf, PA / 1,333 |
| 249. | 12.84 | Elkton, MD / 15,029 |
| 250. | 12.82 | Fawn Grove, PA / 518 |
| 251. | 12.82 | Hillsboro, MD / 111 |
| 252. | 12.82 | Loganville, PA / 1,161 |
| 253. | 12.80 | Edesville, MD / 203 |
| 254. | 12.80 | Maytown, PA / 4,000 |
| 255. | 12.79 | Denton, MD / 4,204 |
| 256. | 12.79 | Mount Rainier, MD / 8,149 |
| 257. | 12.79 | Capitol Heights, MD / 4,298 |
| 258. | 12.77 | Littlestown, PA / 4,428 |
| 259. | 12.76 | Pennville, PA / 2,265 |
| 260. | 12.76 | Ferndale, MD / 17,104 |
| 261. | 12.75 | Manheim, PA / 4,863 |
| 262. | 12.75 | Pomeroy, PA / 346 |
| 263. | 12.75 | West Grove, PA / 2,838 |
| 264. | 12.74 | Rising Sun, MD / 2,651 |
| 265. | 12.72 | West York, PA / 4,586 |
| 266. | 12.71 | New Carrollton, MD / 12,123 |
| 267. | 12.70 | Leola, PA / 7,154 |
| 268. | 12.69 | Seat Pleasant, MD / 4,612 |
| 269. | 12.68 | Hanover, PA / 15,256 |
| 270. | 12.67 | Quarryville, PA / 2,476 |
| 271. | 12.65 | Winterstown, PA / 602 |
| 272. | 12.62 | Marietta, PA / 2,604 |
| 273. | 12.61 | Brownstown CDP, PA / 2,118 |
| 274. | 12.61 | Mcsherrystown, PA / 3,010 |
| 275. | 12.60 | Weigelstown, PA / 12,917 |
| 276. | 12.60 | East Berlin, PA / 1,657 |
| 277. | 12.59 | Peppermill Village, MD / 4,842 |
| 278. | 12.55 | Cordova, MD / 543 |
| 279. | 12.54 | Oxford, PA / 4,971 |
| 280. | 12.53 | Union Bridge, MD / 836 |
| 281. | 12.52 | Parkville, PA / 6,553 |
| 282. | 12.52 | Landover, MD / 23,540 |
| 283. | 12.50 | Delta, PA / 633 |
| 284. | 12.49 | Seven Valleys, PA / 529 |
| 285. | 12.49 | Bladensburg, MD / 8,918 |
| 286. | 12.48 | Little Britain, PA / 219 |
| 287. | 12.45 | Yorklyn, PA / 1,828 |
| 288. | 12.45 | Dover, PA / 2,154 |
| 289. | 12.44 | Greensboro, MD / 2,455 |
| 290. | 12.44 | Ridgely, MD / 2,257 |
| 291. | 12.43 | Cheswold, DE / 1,352 |
| 292. | 12.42 | Spring Grove, PA / 2,303 |
| 293. | 12.42 | Essex, MD / 38,790 |
| 294. | 12.41 | Paradise, PA / 1,006 |
| 295. | 12.41 | Georgetown, MD / 254 |
| 296. | 12.40 | Rodney Village, DE / 1,773 |
| 297. | 12.40 | Manchester, PA / 2,710 |
| 298. | 12.38 | Susquehanna Trails, PA / 2,558 |
| 299. | 12.36 | Delaware City, DE / 1,723 |
| 300. | 12.36 | Emigsville, PA / 2,490 |
| 301. | 12.35 | East Prospect, PA / 683 |
| 302. | 12.34 | Riverdale Park, MD / 6,893 |
| 303. | 12.33 | Wrightsville, PA / 2,302 |
| 304. | 12.32 | Dallastown, PA / 4,085 |
| 305. | 12.32 | Bainbridge, PA / 1,357 |
| 306. | 12.30 | Coatesville, PA / 12,774 |
| 307. | 12.30 | Middle River, MD / 23,799 |
| 308. | 12.30 | Washington Boro, PA / 722 |
| 309. | 12.28 | Modena, PA / 466 |
| 310. | 12.26 | East Earl, PA / 1,550 |
| 311. | 12.25 | Woodlawn CDP, MD / 6,490 |
| 312. | 12.25 | Elsmere, DE / 6,103 |
| 313. | 12.24 | Edgemere, MD / 9,053 |
| 314. | 12.24 | Barclay, MD / 168 |
| 315. | 12.24 | Midway, PA / 2,287 |
| 316. | 12.24 | Millington, MD / 597 |
| 317. | 12.23 | Gap, PA / 1,246 |
| 318. | 12.22 | Blue Ball, PA / 786 |
| 319. | 12.22 | Yoe, PA / 890 |
| 320. | 12.21 | Fairmount Heights, MD / 1,292 |
| 321. | 12.19 | Leipsic, DE / 126 |
| 322. | 12.17 | Jefferson borough, PA / 682 |
| 323. | 12.15 | Yorkana, PA / 226 |
| 324. | 12.15 | New Oxford, PA / 1,757 |
| 325. | 12.15 | Lancaster, PA / 58,819 |
| 326. | 12.14 | Newport, DE / 1,035 |
| 327. | 12.11 | North York, PA / 1,764 |
| 328. | 12.11 | Cecilton, MD / 433 |
| 329. | 12.10 | Dundalk, MD / 62,444 |
| 330. | 12.09 | Brooklyn Park, MD / 14,178 |
| 331. | 12.09 | Abbottstown, PA / 953 |
| 332. | 12.07 | Bonneauville, PA / 1,945 |
| 333. | 12.04 | Chillum, MD / 35,034 |
| 334. | 12.00 | Felton, PA / 461 |
| 335. | 12.00 | Refton, PA / 209 |
| 335. | 12.00 | Sudlersville, MD / 301 |
| 337. | 11.99 | Columbia, PA / 10,391 |
| 338. | 11.97 | Westwood, PA / 584 |
| 339. | 11.96 | Wilmington Manor, DE / 7,865 |
| 340. | 11.96 | Landover Hills, MD / 1,876 |
| 341. | 11.92 | Kennett Square, PA / 5,959 |
| 342. | 11.91 | Salem, NJ / 5,289 |
| 343. | 11.90 | Cottage City, MD / 1,106 |
| 344. | 11.89 | Christiana, PA / 1,438 |
| 345. | 11.88 | Fairlee, MD / 239 |
| 346. | 11.86 | Windsor, PA / 1,666 |
| 347. | 11.85 | Baltimore Highlands, MD / 7,319 |
| 348. | 11.84 | Worton, MD / 136 |
| 349. | 11.83 | Butlertown, MD / 662 |
| 350. | 11.83 | North Brentwood, MD / 555 |
| 351. | 11.82 | York, PA / 43,592 |
| 352. | 11.77 | Witmer, PA / 576 |
| 353. | 11.76 | York Haven, PA / 699 |
| 354. | 11.75 | Colmar Manor, MD / 1,383 |
| 355. | 11.55 | Wakefield, PA / 626 |
| 356. | 11.47 | Intercourse, PA / 969 |
| 357. | 11.45 | Hancocks Bridge, NJ / 308 |
| 358. | 11.41 | Bird In Hand, PA / 306 |
| 359. | 11.41 | Edmonston, MD / 1,328 |
| 360. | 11.39 | Brentwood, MD / 3,037 |
| 361. | 11.38 | East Riverdale, MD / 15,669 |
| 362. | 11.36 | Templeville, MD / 178 |
| 363. | 11.34 | Toughkenamon, PA / 1,420 |
| 364. | 11.34 | Lansdowne, MD / 8,629 |
| 365. | 11.26 | Marydel, MD / 300 |
| 366. | 11.19 | Goldsboro, MD / 338 |
| 367. | 11.10 | Jessup, MD / 11,078 |
| 368. | 11.03 | Avondale, PA / 1,426 |
| 369. | 11.00 | Kenton, DE / 78 |
| 370. | 10.97 | West Denton, MD / 103 |
| 371. | 10.94 | Kirkwood, PA / 333 |
| 372. | 10.86 | Gordonville, PA / 698 |
| 373. | 10.70 | Georgetown CDP, PA / 999 |
| 374. | 10.55 | Ronks, PA / 266 |
| 375. | 10.44 | Farmersville, PA / 1,654 |
| 376. | 10.23 | Henderson, MD / 203 |
| 377. | 10.20 | Langley Park, MD / 18,159 |
Please note that we only rank locations with 'Average Education Index' data. The rank above might not be a complete list. Locations without 'Average Education Index' 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.