| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Abbot | city | Illinois | United States | 37.56 | -88.70 | 830 | |
| Abingdon | city | Illinois | United States | 40.80 | -90.40 | 830 | |
| Acorn Acres | city | Illinois | United States | 42.22 | -88.09 | 849 | |
| Adair | city | Illinois | United States | 40.42 | -90.50 | 830 | |
| Adams | city | Illinois | United States | 39.87 | -91.20 | 830 | |
| Adams (historical) | city | Illinois | United States | 41.10 | -88.58 | 830 | |
| Adams Corner | city | Illinois | United States | 38.51 | -87.74 | 830 | |
| Addieville | city | Illinois | United States | 38.39 | -89.49 | 830 | |
| Addison | city | Illinois | United States | 41.93 | -87.99 | 830 | |
| Adeline | city | Illinois | United States | 42.14 | -89.49 | 830 | |
| Aden | city | Illinois | United States | 38.24 | -88.46 | 380 | |
| Adenmoor | city | Illinois | United States | 39.37 | -87.80 | 830 | |
| Adrian | city | Illinois | United States | 40.52 | -91.17 | 830 | |
| Advance | city | Illinois | United States | 39.16 | -88.03 | 830 | |
| Afolkey | city | Illinois | United States | 42.43 | -89.57 | 908 | |
| Afton Center | city | Illinois | United States | 41.85 | -88.77 | 892 | |
| Agnew | city | Illinois | United States | 41.79 | -89.80 | 830 | |
| Ahern | city | Illinois | United States | 41.15 | -87.60 | 830 | |
| Aiken | city | Illinois | United States | 42.35 | -90.42 | 830 | |
| Akin | city | Illinois | United States | 37.99 | -88.75 | 830 | |
| Akin Junction | city | Illinois | United States | 38.01 | -88.76 | 830 | |
| Akron | city | Illinois | United States | 40.90 | -89.65 | 830 | |
| Aladdin | city | Illinois | United States | 39.72 | -91.32 | 830 | |
| Alandale | city | Illinois | United States | 38.94 | -90.23 | 830 | |
| Albany | city | Illinois | United States | 41.79 | -90.22 | 830 | |
| Albany Park | city | Illinois | United States | 41.97 | -87.72 | 830 | |
| Albers | city | Illinois | United States | 38.54 | -89.61 | 830 | |
| Albion | city | Illinois | United States | 38.38 | -88.06 | 830 | |
| Alda | city | Illinois | United States | 38.46 | -89.24 | 830 | |
| Alden | city | Illinois | United States | 42.46 | -88.52 | 1000 | |
| Aldine Square | city | Illinois | United States | 41.83 | -87.61 | 830 | |
| Aldridge | city | Illinois | United States | 37.56 | -89.47 | 347 | |
| Aledo | city | Illinois | United States | 41.20 | -90.75 | 830 | |
| Alexander | city | Illinois | United States | 39.72 | -90.04 | 830 | |
| Alexis | city | Illinois | United States | 41.06 | -90.56 | 830 | |
| Alexis Junction | city | Illinois | United States | 41.07 | -90.64 | 830 | |
| Algonquin | city | Illinois | United States | 42.17 | -88.29 | 830 | |
| Alhambra | city | Illinois | United States | 38.89 | -89.73 | 830 | |
| Aliceville | city | Illinois | United States | 41.55 | -89.88 | 830 | |
| Allen | city | Illinois | United States | 40.31 | -89.65 | 830 | |
| Allendale | city | Illinois | United States | 38.53 | -87.71 | 830 | |
| Allens Corners | city | Illinois | United States | 42.10 | -88.48 | 990 | |
| Allens Spring | city | Illinois | United States | 37.37 | -88.66 | 400 | |
| Allentown | city | Illinois | United States | 40.56 | -89.40 | 830 | |
| Allenville | city | Illinois | United States | 39.56 | -88.53 | 830 | |
| Allerton | city | Illinois | United States | 39.91 | -87.94 | 830 | |
| Allright | city | Illinois | United States | 39.30 | -87.75 | 830 | |
| Alma | city | Illinois | United States | 38.72 | -88.91 | 830 | |
| Almora | city | Illinois | United States | 42.06 | -88.34 | 830 | |
| Almora Heights | city | Illinois | United States | 42.04 | -88.34 | 830 | |
| Alonzo | city | Illinois | United States | 40.57 | -87.73 | 830 | |
| Alorton | city | Illinois | United States | 38.59 | -90.12 | 413 | |
| Alpha | city | Illinois | United States | 41.19 | -90.38 | 830 | |
| Alpine | city | Illinois | United States | 41.59 | -87.88 | 830 | |
| Alsey | city | Illinois | United States | 39.56 | -90.43 | 830 | |
| Alsip | city | Illinois | United States | 41.67 | -87.74 | 830 | |
| Alta | city | Illinois | United States | 40.81 | -89.63 | 830 | |
| Altamont | city | Illinois | United States | 38.92 | -90.21 | 830 | |
| Altamont | city | Illinois | United States | 39.06 | -88.75 | 830 | |
| Altgeld Gardens | city | Illinois | United States | 41.65 | -87.60 | 830 | |
| Altmar | city | Illinois | United States | 41.14 | -88.89 | 830 | |
| Alto Pass | city | Illinois | United States | 37.57 | -89.32 | 830 | |
| Alton | city | Illinois | United States | 38.89 | -90.18 | 830 | |
| Altona | city | Illinois | United States | 41.11 | -90.16 | 830 | |
| Altorf | city | Illinois | United States | 41.19 | -87.96 | 830 | |
| Alvin | city | Illinois | United States | 40.31 | -87.61 | 830 | |
| Alworth | city | Illinois | United States | 42.24 | -89.25 | 898 | |
| Amboy | city | Illinois | United States | 41.71 | -89.33 | 830 | |
| Amenia | city | Illinois | United States | 40.02 | -88.67 | 830 | |
| Ament Corners | city | Illinois | United States | 41.60 | -88.44 | 830 | |
| America | city | Illinois | United States | 37.14 | -89.12 | 360 | |
| Ames | city | Illinois | United States | 38.15 | -90.05 | 830 | |
| Amherst | city | Illinois | United States | 42.16 | -88.10 | 892 | |
| Amity | city | Illinois | United States | 38.78 | -87.92 | 830 | |
| Anand Brook | city | Illinois | United States | 41.64 | -87.93 | 830 | |
| Anchor | city | Illinois | United States | 40.57 | -88.54 | 830 | |
| Ancient Oaks | city | Illinois | United States | 42.21 | -88.10 | 853 | |
| Ancient Tree | city | Illinois | United States | 42.13 | -87.86 | 830 | |
| Ancona | city | Illinois | United States | 41.04 | -88.87 | 830 | |
| Andalusia | city | Illinois | United States | 41.44 | -90.72 | 830 | |
| Anderson | city | Illinois | United States | 39.98 | -90.16 | 830 | |
| Anderson | city | Illinois | United States | 39.34 | -89.85 | 830 | |
| Andover | city | Illinois | United States | 41.29 | -90.29 | 830 | |
| Andres | city | Illinois | United States | 41.37 | -87.88 | 830 | |
| Andrew | city | Illinois | United States | 39.90 | -89.64 | 830 | |
| Andrews and Hurds Subdivision | city | Illinois | United States | 41.67 | -87.63 | 830 | |
| Anetsberger's Subdivision | city | Illinois | United States | 42.12 | -87.82 | 830 | |
| Anna | city | Illinois | United States | 37.46 | -89.25 | 830 | |
| Annapolis | city | Illinois | United States | 39.14 | -87.82 | 830 | |
| Annawan | city | Illinois | United States | 41.40 | -89.90 | 830 | |
| Anns Mobile Home Park | city | Illinois | United States | 42.24 | -89.11 | 830 | |
| Antioch | city | Illinois | United States | 42.48 | -88.10 | 830 | |
| Appalokia (historical) | city | Illinois | United States | 39.59 | -89.99 | 830 | |
| Appaloosa West | city | Illinois | United States | 41.90 | -88.42 | 830 | |
| Apple Canyon Lake | city | Illinois | United States | 42.42 | -90.16 | 849 | |
| Apple River | city | Illinois | United States | 42.51 | -90.10 | 964 | |
| Applegate | city | Illinois | United States | 38.79 | -87.80 | 830 | |
| Appleton | city | Illinois | United States | 40.94 | -90.16 | 830 | |
| Aptakisic | city | Illinois | United States | 42.18 | -87.95 | 830 | |
| Aptaun | city | Illinois | United States | 41.98 | -87.66 | 830 | |
| Arbor Creek | city | Illinois | United States | 41.58 | -88.18 | 830 | |
| Arbor Gate | city | Illinois | United States | 41.67 | -88.36 | 830 | |
| Arbor Settlement | city | Illinois | United States | 41.59 | -88.19 | 830 | |
| Arboretum Estates | city | Illinois | United States | 41.83 | -88.07 | 830 | |
| Arbury Hills | city | Illinois | United States | 41.54 | -87.85 | 830 | |
| Arcade Row | city | Illinois | United States | 41.69 | -87.61 | 830 | |
| Arcadia | city | Illinois | United States | 39.84 | -90.24 | 830 | |
| Archer | city | Illinois | United States | 39.78 | -89.74 | 830 | |
| Archer Heights | city | Illinois | United States | 41.81 | -87.73 | 830 | |
| Archer Limits | city | Illinois | United States | 41.81 | -87.75 | 830 | |
| Archie | city | Illinois | United States | 39.89 | -87.83 | 830 | |
| Arcola | city | Illinois | United States | 39.68 | -88.31 | 830 | |
| Arenzville | city | Illinois | United States | 39.88 | -90.37 | 830 | |
| Argenta | city | Illinois | United States | 39.98 | -88.82 | 830 | |
| Argo Fay | city | Illinois | United States | 42.00 | -90.02 | 830 | |
| Argyle | city | Illinois | United States | 42.36 | -88.94 | 898 | |
| Arlington | city | Illinois | United States | 41.47 | -89.25 | 830 | |
| Arlington Heights | city | Illinois | United States | 39.82 | -89.60 | 830 | |
| Arlington Heights | city | Illinois | United States | 42.09 | -87.98 | 830 | |
| Armington | city | Illinois | United States | 40.34 | -89.31 | 830 | |
| Armour Patch | city | Illinois | United States | 41.82 | -87.66 | 830 | |
| Armour Square | city | Illinois | United States | 41.84 | -87.63 | 830 | |
| Armsby (historical) | city | Illinois | United States | 42.47 | -88.41 | 898 | |
| Armstrong | city | Illinois | United States | 40.31 | -87.88 | 830 | |
| Arnold | city | Illinois | United States | 39.72 | -90.15 | 830 | |
| Arnold | city | Illinois | United States | 42.17 | -90.23 | 830 | |
| Aroma Park | city | Illinois | United States | 41.08 | -87.81 | 830 | |
| Arpee | city | Illinois | United States | 41.18 | -90.95 | 830 | |
| Arrow Ridge Mobile Home Park | city | Illinois | United States | 41.68 | -87.78 | 830 | |
| Arrowhead | city | Illinois | United States | 42.12 | -87.86 | 830 | |
| Arrowsmith | city | Illinois | United States | 40.45 | -88.63 | 872 | |
| Arsenal Island | city | Illinois | United States | 41.51 | -90.58 | 830 | |
| Arthur | city | Illinois | United States | 39.71 | -88.47 | 830 | |
| Arthur L Johnson Subdivision | city | Illinois | United States | 42.19 | -89.08 | 830 | |
| Ashburn | city | Illinois | United States | 41.75 | -87.71 | 830 | |
| Ashcroft | city | Illinois | United States | 41.67 | -88.34 | 830 | |
| Ashcroft Place | city | Illinois | United States | 41.67 | -88.33 | 830 | |
| Ashdale Junction | city | Illinois | United States | 42.09 | -89.92 | 830 | |
| Ashkum | city | Illinois | United States | 40.88 | -87.96 | 830 | |
| Ashland | city | Illinois | United States | 39.89 | -90.01 | 830 | |
| Ashley | city | Illinois | United States | 38.33 | -89.19 | 830 | |
| Ashmore | city | Illinois | United States | 39.53 | -88.02 | 830 | |
| Ashton | city | Illinois | United States | 41.87 | -89.22 | 830 | |
| Askvig Addition | city | Illinois | United States | 41.94 | -89.07 | 830 | |
| Aspen Meadows | city | Illinois | United States | 41.56 | -88.23 | 830 | |
| Assumption | city | Illinois | United States | 39.52 | -89.05 | 830 | |
| Astoria | city | Illinois | United States | 40.23 | -90.36 | 830 | |
| Athens | city | Illinois | United States | 39.96 | -89.72 | 830 | |
| Athensville | city | Illinois | United States | 39.46 | -90.19 | 830 | |
| Atkinson | city | Illinois | United States | 41.42 | -90.02 | 830 | |
| Atlanta | city | Illinois | United States | 40.26 | -89.23 | 830 | |
| Atlas | city | Illinois | United States | 39.51 | -90.97 | 830 | |
| Atterberry | city | Illinois | United States | 40.06 | -89.92 | 830 | |
| Attila | city | Illinois | United States | 37.77 | -88.77 | 830 | |
| Atwater | city | Illinois | United States | 39.33 | -89.73 | 830 | |
| Atwood | city | Illinois | United States | 39.80 | -88.46 | 830 | |
| Atwood Estates | city | Illinois | United States | 42.19 | -89.05 | 830 | |
| Atwood Park Estates | city | Illinois | United States | 42.19 | -89.05 | 830 | |
| Auburn | city | Illinois | United States | 39.59 | -89.75 | 830 | |
| Auburn Park | city | Illinois | United States | 41.75 | -87.64 | 830 | |
| Augerville | city | Illinois | United States | 40.14 | -88.17 | 830 | |
| Augsburg | city | Illinois | United States | 38.87 | -89.01 | 830 | |
| Augusta | city | Illinois | United States | 40.23 | -90.95 | 830 | |
| Aurora | city | Illinois | United States | 41.76 | -88.32 | 830 | |
| Austin | city | Illinois | United States | 41.89 | -87.76 | 830 | |
| Autumn Lake Estates | city | Illinois | United States | 41.55 | -88.17 | 830 | |
| Aux Sable | city | Illinois | United States | 41.39 | -88.33 | 830 | |
| Ava | city | Illinois | United States | 37.89 | -89.49 | 830 | |
| Avalon Highlands | city | Illinois | United States | 41.75 | -87.60 | 830 | |
| Avalon Park | city | Illinois | United States | 41.75 | -87.59 | 830 | |
| Avanti Ridge | city | Illinois | United States | 42.14 | -87.89 | 830 | |
| Avena | city | Illinois | United States | 39.01 | -88.93 | 830 | |
| Avery Hill | city | Illinois | United States | 38.55 | -90.03 | 830 | |
| Averyville | city | Illinois | United States | 40.72 | -89.56 | 830 | |
| Aviston | city | Illinois | United States | 38.61 | -89.61 | 830 | |
| Avoca (historical) | city | Illinois | United States | 40.81 | -88.52 | 830 | |
| Avon | city | Illinois | United States | 40.66 | -90.43 | 830 | |
| Avondale | city | Illinois | United States | 41.94 | -87.71 | 830 | |
| Ayers | city | Illinois | United States | 42.05 | -90.12 | 830 | |
| Ayers | city | Illinois | United States | 38.96 | -89.45 | 830 |