Alton, IL Profile: Facts, Map & Data


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Alton, Illinois - Basic Facts

The City of Alton had a population of 26,822 as of July 1, 2017. 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, 2017.

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City of Alton, IL Boundary Map

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Boundary Maps: Township of Alton | Madison County | Illinois Counties

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Alton, IL Data & Demographics (As of July 1, 2017)


Total Population 26,822
Daytime Population: Workers 17,817
Daytime Population: Residents 15,539
Total Daytime Population (TDP) 33,356
Ratio TDP/Total Population1 1.24
Population in Households 26,311
Population in Familes 19,584
Population in Group Qrtrs 511
Population Density2 1,734
Diversity Index3 51


Median Household Income $36,564
Average Household Income $48,352
Per Capita Income $20,957


Total Housing Units 13,309 (100%)
Owner Occupied HU 6,481 (48.7%)
Renter Occupied HU 4,821 (36.2%)
Vacant Housing Units 2,007 (15.1%)
Median Home Value $80,210
Average Home Value $93,524


Total Households 11,302
Average Household Size 2.33
Family Households 6,520
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood 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.


2010-2017 2017-2022
Population -0.52% -0.32%
Households -0.52% -0.33%
Families -0.69% -0.48%
Median Household Income   -0.21%
Per Capita Income   1.78%

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, 2017 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 Density # 370 73rd
Diversity Index # 180 87th
Median Household Income # 1288 6th
Per Capita Income # 1219 11th

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

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