Index data (photograph center points) are offered by county in in ESRI Shapefile format. These data contain information for each aerial photograph, including the digital file name, flight line, county name, historic county code, roll and exposure numbers, agency which contributed the original photographic paper print for scanning, acquisition date and time (if available), the CD-ROM on which the original file is stored at the ISGS, and any additional notes.
Hard copy county indexes for aerial photography are housed at the University of Illinois Map and Geography Library. These indexes are either photo-mosaics of the prints for a single county (Photo Index), or drawn representations of approximate print locations (Line Index). Compressed digital versions of these indexes are available for viewing or download for each county. These indexes can be difficult to interpret. The majority of counties are depicted on one index sheet; some counties are divided into multiple sheets.
| ILHAP County | Index Data | Photo Index | Line Index |
|---|---|---|---|
| Adams | adams.zip | - | Adams (8.2 Mb) |
| Alexander | coming soon | Alexander (5.9 Mb) | - |
| Boone | boone.zip | Boone (3.6 Mb) | - |
| Brown | brown.zip | Brown 1 (3.2 Mb),
Brown 2 (3.4 Mb),
Brown 3 (1.7 Mb), Brown 4 (3.5 Mb), Brown 5 (3.7 Mb), Brown 6 (3.6 Mb), Brown 7 (3.1 Mb), Brown 8 (3.3 Mb), Brown 9 (2.8 Mb) | - |
| Bureau | bureau.zip | Bureau NE (2.9 Mb), Bureau NW (2.9 Mb), Bureau SW (2.5 Mb), Bureau SE (2.1 Mb) |
- |
| Cass | cass.zip | Cass 1 (0.7 Mb),
Cass 2 (2.4 Mb),
Cass 3 (2.1 Mb),
Cass 4 (1.6 Mb), Cass 5 (2.0 Mb), Cass 6 (2.8 Mb), Cass 7 (2.6 Mb), Cass 8 (2.8 Mb), Cass 9 (2.6 Mb), Cass 10 (2.4 Mb), Cass 11 (2.3 Mb), Cass 12 (2.4 Mb) | - |
| Calhoun | calhoun.zip | Calhoun NE (2.8 Mb), Calhoun NW (1.2 Mb), Calhoun SE (2.4 Mb) |
- |
| Champaign | champaign.zip | Champaign NE (3.9 Mb), Champaign NW (3.9 Mb), Champaign SW (3.4 Mb), Champaign SE (3.6 Mb) |
- |
| Clark | clark.zip | - | Clark (7.1 Mb) |
| Clinton | clinton.zip | - | Clinton (6.6 Mb) |
| Coles | coles.zip | Coles (3.6 Mb) | - |
| Cook | cook.zip | Cook S (2.4 Mb), Cook NW (1.9 Mb), Cook NE (2.5 Mb) | - |
| Cumberland | cumberland.zip | - | Cumberland (2.1 Mb) |
| DeWitt | dewitt.zip | - | DeWitt (4.0 Mb) |
| Douglas | douglas.zip | Douglas E (4.9 Mb), Douglas W (5.0 Mb) | - |
| DuPage | dupage.zip | - | DuPage (4.0 Mb) |
| Edwards | edwards.zip | Edwards (3.2 Mb) | - |
| Fulton | fulton.zip | - | Fulton (9.1 Mb) |
| Gallatin | gallatin.zip | Gallatin (4.7 Mb) | - |
| Greene | greene.zip | - | Greene (5.9 Mb) |
| Grundy | grundy.zip | Grundy (2.8 Mb) | - |
| Hancock | hancock.zip | - | Hancock (7.1 Mb) |
| Hardin | hardin.zip | Hardin (5.4 Mb) | - |
| Jackson | coming soon | Jackson NW (4.0 Mb),
Jackson NE (4.3 Mb),
Jackson SW (3.1 Mb), Jackson SE (4.1 Mb), | - |
| Jersey | jersey.zip | - | Jersey (3.9 Mb) |
| Johnson | johnson.zip | Johnson (3.7 Mb) | - |
| JoDaviess | coming soon | JoDaviess NW (4.1 Mb),
JoDaviess NC (4.0 Mb),
JoDaviess NE (1.9 Mb), JoDaviess SE (3.3 Mb), JoDaviess SW (3.9 Mb) | - |
| Kane | kane.zip | - | Kane (4.7 Mb) |
| Kankakee | kankakee.zip | - | Kankakee (7.2 Mb) |
| Kendall | kendall.zip | - | Kendall (5.6 Mb) |
| Knox | knox.zip | Knox (3.7 Mb) | - |
| Lake | lake.zip | - | Lake (4.0 Mb) |
| LaSalle | lasalle.zip | LaSalle NW (3.2 Mb),
LaSalle NE (3.1 Mb), LaSalle CW (3.1 Mb), LaSalle CE (3.1 Mb), LaSalle S (1.2 Mb) | - |
| Madison | madison.zip | - | Madison (7.5 Mb) |
| Marshall | marshall.zip | - | Marshall (6.1 Mb) |
| Mason | mason.zip | - | Mason (8.1 Mb) |
| Massac | massac.zip | - | Massac (5.8 Mb) |
| Menard | menard.zip | - | Menard (5.8 Mb) |
| McHenry | mchenry.zip | McHenry W (4.0 Mb), McHenry E (4.1 Mb) | McHenry (5.6 Mb) |
| Monroe | monroe.zip | Monroe NW (2.5 Mb), Monroe SW (2.8 Mb), Monroe E (1.9 Mb) | Monroe (6.5 Mb) |
| Morgan | morgan.zip | - | Morgan (5.9 Mb) |
| Peoria | peoria.zip | Peoria NW (4.1 Mb),
Peoria NE (3.7 Mb), Peoria S (3.7 Mb) |
Peoria (8.9 Mb) |
| Perry | coming soon | Perry (5.3 Mb) | - |
| Pike | pike.zip | - | Pike (6.7 Mb) |
| Pope | pope.zip | Pope N (5.9 Mb), Pope S (4.6 Mb) | - |
| Pulaski | pulaski.zip | - | Pulaski (3.8 Mb) |
| Putnam | putnam.zip | - | Putnam (3.5 Mb) |
| Randolph | coming soon | Randolph NE (4.7 Mb),
Randolph NW (3.8 Mb),
Randolph SW (2.2 Mb), Randolph SE (4.3 Mb), | - |
| St. Clair | stclair.zip | St. Clair NW (3.1 Mb), St. Clair NE (3.0 Mb), St. Clair SW (1.8 Mb), St. Clair SE (3.1 Mb) | St. Clair (6.1 Mb) |
| Saline | saline.zip | Saline (5.5 Mb) | - |
| Sangamon | sangamon.zip | Sangamon NW (2.8 Mb),
Sangamon NE (2.8 Mb), Sangamon SW (3.2 Mb), Sangamon SE (2.3 Mb) | Sangamon (10.6 Mb) |
| Schuyler | schuyler.zip | - | Schuyler (6.9 Mb) |
| Scott | scott.zip | - | Scott (3.5 Mb) |
| Stark | stark.zip | - | Stark (3.9 Mb) |
| Tazewell | tazewell.zip | - | Tazewell (6.6 Mb) |
| Union | union.zip | Union (4.1 Mb) | - |
| Vermilion | vermilion.zip | Vermilion NE (3.4 Mb), Vermilion NW (3.3 Mb),
Vermilion SW (3.4 Mb), Vermilion SE (3.5 Mb) |
- |
| Washington | washington.zip | - | Washington (7.0 Mb) |
| Will | will.zip | Will NW (4.0 Mb), Will SW (3.8 Mb), Will E (2.8 Mb) | - |
| Williamson | williamson.zip | Williamson (6.5 Mb) | - |
| Winnebago | winnebago.zip | Winnebago (5.0 Mb) | Winnebago (2.6 Mb) |
| Woodford | woodford.zip | - | Woodford (5.6 Mb) |