Decatur, AL Profile: Facts, Map & Data


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Decatur, Alabama - Basic Facts

The City of Decatur had a population of 55,672 as of July 1, 2017. Decatur ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Alabama. See peer rankings below.

The primary coordinate point for Decatur is located at latitude 34.5733 and longitude -86.9921 in Morgan County. The formal boundaries for the City of Decatur (see map below) encompass a land area of 54.11 sq. miles and a water area of 6.79 sq. miles. Morgan County is in the Central time zone (GMT -6). The elevation is 561 feet.

While the primary coordinates for City of Decatur are located in Morgan County, it should be noted that the formal boundaries for this community also extend into and Limestone County.

The City of Decatur (GNIS ID: 2404206) 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.

Alabama is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The City of Decatur is located within Decatur Division of Morgan County.

Beneath the boundary map are tables with Decatur population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Neighborhood Data

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City of Decatur, AL Boundary Map

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Boundary Maps: Decatur Division | Morgan County | Alabama Counties

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Decatur, AL Data & Demographics (As of July 1, 2017)


Total Population 55,672
Daytime Population: Workers 33,718
Daytime Population: Residents 30,730
Total Daytime Population (TDP) 64,448
Ratio TDP/Total Population1 1.16
Population in Households 54,332
Population in Familes 43,805
Population in Group Qrtrs 1,340
Population Density2 1,029
Diversity Index3 64


Median Household Income $43,713
Average Household Income $61,057
Per Capita Income $25,094


Total Housing Units 24,827 (100%)
Owner Occupied HU 13,415 (54.0%)
Renter Occupied HU 9,100 (36.7%)
Vacant Housing Units 2,312 ( 9.3%)
Median Home Value $132,858
Average Home Value $164,431


Total Households 22,515
Average Household Size 2.41
Family Households 14,574
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 0.01% -0.07%
Households -0.03% -0.08%
Families -0.31% -0.22%
Median Household Income   2.68%
Per Capita Income   2.38%

Decatur, AL - Peer Comparisons by Rank and Percentile

The table below compares Decatur to the other 580 incorporated cities, towns and CDPs in Alabama 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 # 9 99th
Population Density # 42 93rd
Diversity Index # 12 98th
Median Household Income # 195 67th
Per Capita Income # 113 81st

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

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