Slidell, LA Profile: Facts & Data


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Slidell, Louisiana - Basic Facts

The City of Slidell had a population of 29,718 as of July 1, 2020. Slidell ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Louisiana. See peer rankings below.

The primary coordinate point for Slidell is located at latitude 30.2752 and longitude -89.7812 in St. Tammany Parish. The formal boundaries for the City of Slidell encompass a land area of 14.84 sq. miles and a water area of 0.36 sq. miles. St. Tammany Parish is in the Central time zone (GMT -6). The elevation is 3 feet.

The City of Slidell (GNIS ID: 2405470) 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 Slidell is located within Parish Governing Authority District 14, a minor civil division (MCD) of St. Tammany Parish.


Slidell, LA Data & Demographics (As of July 1, 2020)


Total Population 29,718 (100%)
Population in Households 29,445 (99.1%)
Population in Families 24,245 (81.6%)
Population in Group Quarters1 273 ( 0.9%)
Population Density 1,939
Diversity Index2 52


Median Household Income $52,280
Average Household Income $70,670
% of Income for Mortgage4 13%
Per Capita Income $26,426
Wealth Index5 72


Total HU (Housing Units) 12,217 (100%)
Owner Occupied HU 8,193 (67.1%)
Renter Occupied HU 2,904 (23.8%)
Vacant Housing Units 1,120 ( 9.2%)
Median Home Value $162,686
Average Home Value $177,759
Housing Affordability Index3 197


Total Households 11,097
Average Household Size 2.65
Family Households 7,722
Average Family Size 3
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. 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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2020 2020-2025
Population 0.9% 0.8%
Households 0.96% 0.84%
Families 0.75% 0.67%
Median Household Income   0.81%
Per Capita Income   1.26%
Owner Occupied HU   0.8%


Slidell, LA - Peer Comparisons by Rank and Percentile

The table below compares Slidell to the other 474 incorporated cities, towns and CDPs in Louisiana by rank and percentile using July 1, 2020 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 97th
Population Density # 56 88th
Median Household Income # 119 75th
Housing Affordability Index # 198 42nd
Per Capita Income # 135 72nd
Diversity Index # 176 63rd

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

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