Marion, IA Profile: Facts & Data


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Marion, Iowa - Basic Facts

The City of Marion had a population of 38,900 as of July 1, 2018. Marion ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Iowa. See peer rankings below.

The primary coordinate point for Marion is located at latitude 42.0446 and longitude -91.5862 in Linn County. The formal boundaries for the City of Marion (see map below) encompass a land area of 16.05 sq. miles and a water area of 0.01 sq. miles. Linn County is in the Central time zone (GMT -6). The elevation is 846 feet.

The City of Marion (GNIS ID: 2395011) 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 Marion is located within Township of Marion, a minor civil division (MCD) of Linn County.

Beneath the boundary map are tables with Marion population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2018.

Jump to... (On This Page!)
  1. Marion 2018 Demographic Data
  2. Growth Rates for Marion (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Iowa Research Tools (Easy Tools & Current Data)
  3. Iowa Data Comparison Tool - 2018 Demographics

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Marion, IA Data & Demographics (As of July 1, 2018)


Total Population 38,900
Population in Households 38,551
Population in Familes 30,988
Population in Group Qrtrs 349
Population Density2 2,424
Diversity Index3 21


Median Household Income $72,271
Average Household Income $88,632
Per Capita Income $35,629


Total Housing Units 16,359 (100%)
Owner Occupied HU 12,267 (75.0%)
Renter Occupied HU 3,308 (20.2%)
Vacant Housing Units 784 ( 4.8%)
Median Home Value $183,463
Average Home Value $214,698


Total Households 15,575
Average Household Size 2.48
Family Households 10,231
Average Family Size 3
  1. Demographics are point estimates for July 1st of the current year and each for the forecast years. See References for more information.
  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.


2010-2018 2018-2023
Population 1.37% 1.21%
Households 1.21% 1.12%
Families 1.15% 1.04%
Median Household Income   1.53%
Per Capita Income   2.03%

Marion, IA - Peer Comparisons by Rank and Percentile

The table below compares Marion to the other 1,009 incorporated cities, towns and CDPs in Iowa by rank and percentile using July 1, 2018 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 # 14 99th
Population Density # 12 99th
Diversity Index # 161 84th
Median Household Income # 109 89th
Per Capita Income # 113 89th

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

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Iowa Census Data Comparison Tool

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