| State of Illinois |
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| Total population | 12,419,293 | Rank: | 5th | |
| Percent of people in same-sex couples | 0.37% | Rank: | 29th | |
| Total same-sex couples | 22887 | Rank: | 5th | |
| Percent of male couples | 0.47% | Rank: | 21st | |
| Percent of female couples | 0.42% | Rank: | 34th | |
| By county | By census tract | By zip code | By state MSA | |
| By ncorporated place | Maps | |||