Indiana
...Indiana Skip Navigation Within Census Geographies Indiana Access Public Use...Area (PUMA) Maps Indiana Maps Code Name 18 00101 Lake County (Northwest)--Hammond
https://www.census.gov/geographies/reference-maps/2010/geo/2010-pumas/indiana.html
Illinois
December 3, 1818 (21st) Bordering States: Indiana, Iowa, Kentucky, Missouri, Wisconsin...3, 1809, from the western part of Indiana Territory, and included all of present-day
https://www.census.gov/geographies/reference-files/2010/geo/state-local-geo-guides-2010/illinois.html
Evaluation of 2000 Subcounty Population Estimates
...and housing unit loss to distribute county population to incorporated places and...and minor civil divisions within counties. The availability of Census 2000 data
https://www.census.gov/library/working-papers/2003/demo/POP-twps0070.html
2017 Census of Governments
... . . . . . . . . . . . . . . . 83 Indiana . . . . . . . . . . . . . . . . .... . 310 Appendixes A. County-Type Areas Without County Government . . . . .
https://www.census.gov/content/dam/Census/library/publications/2017/econ/2017isd.pdf