St. Mary Parish LA Information


St. Mary Parish Subdivisions

St. Mary Parish LA Data & Demographics (As of July 1, 2015)


Total Population 54,978
Population in Households 54,110
Population in Familes 44,488
Population in Group Qrtrs 868
Population Density1 99
Diversity Index2 61


Total Households 20,890
Average Household Size 2.59
Family Households 14,313
Average Family Size 3


Total Housing Units 23,610 (100%)
Owner Occupied HU 13,988 (59.2%)
Renter Occupied HU 6,902 (29.2%)
Vacant Housing Units 2,720 (11.5%)
Median Home Value $90,851
Average Home Value $110,429


Median Household Income $41,732
Average Household Income $56,083
Per Capita Income $21,428
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.11% 0.07%
Households 0.4% 0.15%
Families 0.18% -0.03%
Median Household Income   3.25%
Per Capita Income   2.26%
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.


St. Mary Parish LA - Peer Comparisons by Rank and Percentile

The table below compares St. Mary Parish to the other 64 parishes and parish equivalents in Louisiana by rank and percentile using July 1, 2015 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 # 21 69th
Population Density1 # 20 70th
Diversity Index2 # 2 98th
Median Household Income # 30 55th
Per Capita Income # 34 48th

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