| * 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 |
|---|---|---|---|---|---|
| City of Columbia | Illinois | Partial | 06-09-2017 | 3,055 | 1,059 |
| City of Lockport | Illinois | Partial | 06-02-2017 | 1,173 | 392 |
| City of Mascoutah | Illinois | Partial | 05-19-2017 | 2,726 | 980 |
| City of O'Fallon | Illinois | Partial | 01-12-2017 | 6,173 | 2,198 |
| City of Washington | Illinois | Partial | 11-09-2017 | 3,120 | 1,128 |
| City of Waterloo | Illinois | Partial | 07-14-2017 | 2,865 | 1,178 |
| United City of Yorkville | Illinois | Partial | 06-23-2017 | 4,456 | 1,620 |
| Village of Deerfield | Illinois | Partial | 02-14-2017 | 555 | 488 |
| Village of Glenview | Illinois | Partial | 07-21-2017 | 2,766 | 1,661 |
| Village of Hawthorn Woods | Illinois | Partial | 09-15-2017 | 1,054 | 335 |
| Village of Lisle | Illinois | Partial | 01-20-2017 | 1,086 | 563 |
| Village of Mokena |
Illinois | Partial | 10-06-2017 | 3,399 | 1,161 |
| Village of Shorewood | Illinois | Partial | 02-17-2017 | 6,998 | 2,790 |
| Village of Volo | Illinois | Full | 02-17-2017 | 5,399 | 1,911 |
| Village of Wauconda | Illinois | Partial | 11-09-2017 | 631 | 173 |
The above data includes U.S. Census Bureau official counts issued for completed Special Censuses conducted in Illinois during 2017.