Alton, IL Profile: Facts, Map & Data


Alton Local Links & Resources:
Hotels | Resources | ALL Alton Content

Also See: Alton, IL ZIP Codes & ZIP Code Maps | Local Area Photos

Alton, Illinois - Basic Facts

The City of Alton had a population of 26,972 as of July 1, 2016. Alton ranks in the upper quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Alton is located at latitude 38.9021 and longitude -90.1541 in Madison County. The formal boundaries for the City of Alton (see map below) encompass a land area of 15.47 sq. miles and a water area of 1.27 sq. miles. Madison County is in the Central time zone (GMT -6). The elevation is 495 feet.

The City of Alton (GNIS ID: 2393935) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The City of Alton is located within Township of Alton, a minor civil division (MCD) of Madison County.

Beneath the boundary map are tables with Alton population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2016.

Neighborhood Data

Address Based Hyperlocal Data Input an address and get data & demographics for the pertinent census block group (CBG), a searchable map and a customized directory. The CBG is the smallest geographical unit used by the Census Bureau for reporting certain data.


City of Alton, IL Boundary Map

Also See: BIG Map | Driving Directions | IL Congressional Districts
Boundary Maps: Township of Alton | Madison County | Illinois Counties

Search the map for:

Alton, IL Data & Demographics (As of July 1, 2016)


Total Population 26,972
Population in Households 26,464
Population in Familes 19,701
Population in Group Qrtrs 508
Population Density1 1,744
Diversity Index2 50


Total Households 11,374
Average Household Size 2.33
Family Households 6,575
Average Family Size 3


Total Housing Units 13,327 (100%)
Owner Occupied HU 6,564 (49.3%)
Renter Occupied HU 4,810 (36.1%)
Vacant Housing Units 1,953 (14.7%)
Median Home Value $78,935
Average Home Value $91,168


Median Household Income $35,899
Average Household Income $46,283
Per Capita Income $20,098
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population -0.52% -0.27%
Households -0.5% -0.26%
Families -0.66% -0.4%
Median Household Income   -0.82%
Per Capita Income   0.59%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

Alton, IL - Peer Comparisons by Rank and Percentile

The table below compares Alton to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2016 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 80 94th
Population Density1 # 377 73rd
Diversity Index2 # 179 87th
Median Household Income # 1259 8th
Per Capita Income # 1215 11th

Additional comparisons and rankings can be made with a VERY EASY TO USE Illinois Census Data Comparison Tool.

Illinois Research Tools

Illinois Census Data Comparison Tool

Compare Illinois Census Data
Highest or Lowest: