Select one of the following years to view official counts issued to governmental units in the State of Illinois. This information is updated frequently as additional Special Censuses are completed.
| * Full or Partial Special Census indicates whether the entire governmental unit (Full), or a portion of the governmental unit (Partial) was included in the Special Census using current legal boundaries provided by the governmental unit. ** Special Census Day refers to the reference date that enumerators use when conducting interviews with respondents. |
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| Governmental Unit | State | Full or Partial Special Census* | Special Census Day** | Official Population Count | Official Housing Unit Count |
|---|---|---|---|---|---|
| Arlington Heights | Illinois | Partial | 09-22-2004 | 569 | 425 |
| Batavia city | Illinois | Partial | 06-04-2004 | 1,069 | 465 |
| Beach Park | Illinois | Partial | 10-27-2004 | 2,549 | 973 |
| Beecher | Illinois | Partial | 09-17-2004 | 1,199 | 456 |
| Belleville city | Illinois | Partial | 01-22-2004 | 2,350 | 1,037 |
| Boone County | Illinois | Partial | 12-01-2004 | 46,451 | 17,174 |
| Cary #2 | Illinois | Partial | 02-05-2004 | 331 | 128 |
| Crest Hill | Illinois | Partial | 12-17-2004 | 9,681 | 3,169 |
| DeKalb city | Illinois | Partial | 01-31-2004 | 7,071 | 2,718 |
| Frankfort village | Illinois | Partial | 02-25-2004 | 3,515 | 1,087 |
| Geneva city | Illinois | Partial | 02-06-2004 | 4,136 | 1,178 |
| Gilberts village | Illinois | Partial | 03-31-2004 | 3,193 | 1,154 |
| Glen Carbon | Illinois | Full | 11-19-2004 | 11,799 | 4,902 |
| Hainesville village | Illinois | Partial | 04-14-2004 | 2,130 | 871 |
| Homer Glen | Illinois | Full | 11-19-2004 | 24,083 | 7,716 |
| Lake Villa village | Illinois | Partial | 04-21-2004 | 4,331 | 1,504 |
| Lakemoor village | Illinois | Full | 04-01-2004 | 4,767 | 2,070 |
| Lemont | Illinois | Partial | 11-05-2004 | 4,667 | 1,700 |
| Lincolnshire | Illinois | Partial | 09-07-2004 | 501 | 206 |
| Loves Park | Illinois | Partial | 07-08-2004 | 7,200 | 3,020 |
| Mackinaw | Illinois | Partial | 09-01-2004 | 210 | 92 |
| Maryville village | Illinois | Full | 03-17-2004 | 5,905 | 2,355 |
| McHenry | Illinois | Partial | 07-29-2004 | 6,352 | 2,271 |
| Melrose Park | Illinois | Partial | 07-29-2004 | 20,472 | 7,218 |
| Mokena village | Illinois | Full | 01-16-2004 | 16,171 | 5,433 |
| Montgomery | Illinois | Partial | 07-30-2004 | 5,074 | 1,872 |
| North Aurora | Illinois | Full | 06-11-2004 | 13,764 | 5,147 |
| Orland Park | Illinois | Partial | 07-28-2004 | 9,263 | 3,220 |
| Oswego village | Illinois | Partial | 02-18-2004 | 14,551 | 5,070 |
| Peoria | Illinois | Partial | 09-22-2004 | 10,147 | 4,466 |
| Riverwoods village | Illinois | Partial | 06-01-2004 | 62 | 16 |
| South Elgin village | Illinois | Partial | 01-23-2004 | 6,203 | 1,964 |
| Spring Grove | Illinois | Partial | 09-23-2004 | 2,481 | 770 |
| Sumner | Illinois | Partial | 09-07-2004 | 1,734 | 0 |
| Swansea village | Illinois | Partial | 01-14-2004 | 778 | 356 |
| Washington | Illinois | Partial | 09-17-2004 | 3,569 | 1,465 |
| Waukegan | Illinois | Partial | 05-07-2004 | 4,284 | 2,075 |
| West Chicago city | Illinois | Partial | 03-03-2004 | 3,434 | 1,037 |
| Woodridge | Illinois | Partial | 04-30-2004 | 3,321 | 1,797 |
| Woodstock city | Illinois | Partial | 03-24-2004 | 4,736 | 1,909 |
The above data includes U.S. Census Bureau official counts issued for completed Special Censuses conducted in Illinois during 2004.