Madison County GIS Map
Madison is one of the most repeated county names in the United States: there are 20 counties named Madison spread across 20 states. Each one is a different local government with its own boundary, population and flood maps, so the right GIS map depends on which state you mean.
That is also why a search for Madison GIS turns up several unrelated county systems — the name on its own does not tell you which state's mapping office you are after. Pick the state you need below.
Every county page opens an interactive GIS map of that county's official Census boundary, with FEMA flood zones, USGS elevation contours, land cover and school districts you can turn on, plus population, land area and ZIP code data.
Most people searching for Madison County mean Madison County, Alabama — the largest of them, with a population of about 405,718.
All 20 Madison Counties by state
Ordered by population, largest first.
- Madison CountyAlabama (AL) 405,718 801.6 sq mi
- Madison CountyIllinois (IL) 264,238 715.5 sq mi
- Madison CountyIndiana (IN) 131,900 451.9 sq mi
- Madison CountyMississippi (MS) 111,647 714.2 sq mi
- Madison CountyTennessee (TN) 99,295 557.2 sq mi
- Madison CountyKentucky (KY) 95,769 437.9 sq mi
- Madison CountyNew York (NY) 67,328 654.9 sq mi
- Madison CountyIdaho (ID) 54,618 469.3 sq mi
- Madison CountyOhio (OH) 44,423 466.7 sq mi
- Madison CountyNebraska (NE) 35,532 572.6 sq mi
- Madison CountyGeorgia (GA) 31,528 282.3 sq mi
- Madison CountyNorth Carolina (NC) 21,867 449.6 sq mi
- Madison CountyFlorida (FL) 18,089 696.5 sq mi
- Madison CountyArkansas (AR) 17,329 834.2 sq mi
- Madison CountyIowa (IA) 16,926 561 sq mi
- Madison CountyVirginia (VA) 14,044 320.6 sq mi
- Madison CountyTexas (TX) 13,648 466.1 sq mi
- Madison CountyMissouri (MO) 12,729 494.4 sq mi
- Madison ParishLouisiana (LA) 9,513 623.9 sq mi
- Madison CountyMontana (MT) 9,223 3,588.2 sq mi