Louisiana State Senate District 21

State Legislative District Profile (Upper Chamber)

Overview

District ID
la-sd-021
State
Louisiana
Chamber
Upper chamber (state senate)
District Code
021
Land Area
1,548 sq mi
Water Area
675.3 sq mi

Boundary

Boundary of Louisiana State Senate District 21

Boundary as GeoJSON

Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.

Counties

CountyOverlapShare of district landShare of county land
St. Mary Parish555.84 sq mi35.9%99.5%
Terrebonne Parish369.21 sq mi23.9%30.0%
Iberia Parish232.88 sq mi15.0%40.5%
St. Martin Parish176.92 sq mi11.4%24.0%
Assumption Parish156.22 sq mi10.1%45.4%
Lafourche Parish54.25 sq mi3.5%5.1%

Showing all 6 counties

Places

PlaceOverlapShare of district landShare of place land
Schriever CDP14.25 sq mi0.9%100.0%
Gray CDP11.48 sq mi0.7%100.0%
Franklin city9.92 sq mi0.6%99.6%
Morgan City city5.98 sq mi0.4%100.0%
Berwick town5.90 sq mi0.4%100.0%
Charenton CDP4.97 sq mi0.3%100.0%
Bayou Cane CDP4.88 sq mi0.3%64.1%
Labadieville CDP3.89 sq mi0.3%100.0%
Baldwin town3.22 sq mi0.2%100.0%
Bayou Blue CDP3.11 sq mi0.2%13.4%
Pierre Part CDP3.07 sq mi0.2%100.0%
Bayou L'Ourse CDP2.72 sq mi0.2%100.0%
Patterson city2.52 sq mi0.2%100.0%
Amelia CDP2.52 sq mi0.2%100.0%
Jeanerette city2.31 sq mi0.1%100.0%
Sorrel CDP2.12 sq mi0.1%100.0%
Bayou Vista CDP1.80 sq mi0.1%100.0%
Lydia CDP1.70 sq mi0.1%100.0%
Lafourche Crossing CDP1.22 sq mi0.1%28.9%
Thibodaux city0.98 sq mi0.1%14.4%
Centerville CDP0.94 sq mi0.1%100.0%
Siracusaville CDP0.80 sq mi0.1%100.0%
Glencoe CDP0.66 sq mi<0.1%99.9%
Bayou Corne CDP0.36 sq mi<0.1%100.0%

Showing all 24 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
LA District 3104,19488.2%13.4%89.8%
LA District 213,91111.8%1.8%10.2%

Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).

Voters

Registered Voters
72,637
Active Voters
63,660 (87.6%)

Party Registration

PartyVotersShare
Democratic23,98933.0%
Republican27,74938.2%
Unaffiliated20,44628.1%
Other parties4530.6%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2023–202450,679 (69.8%)0 (0.0%)0 (0.0%)
2021–202233,598 (46.3%)0 (0.0%)0 (0.0%)
2019–202050,480 (69.5%)0 (0.0%)0 (0.0%)
2017–201833,590 (46.2%)0 (0.0%)0 (0.0%)
2015–201644,247 (60.9%)0 (0.0%)0 (0.0%)
2013–201430,636 (42.2%)0 (0.0%)0 (0.0%)
2011–201240,022 (55.1%)0 (0.0%)0 (0.0%)

Turnout counts today's registered voters with a counted ballot in the cycle's elections (the odd and even year), as a share of today's registered voters. Voters who have since left the rolls are not counted.

Browse the voter list for this district (premium access; sign-in required)

Source: Civitech voter file snapshot as of 09/11/2025. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
115,971 (± 2,602)
Median Age
38.7
Median Household Income
$60,249 (± $2,154)
High School Graduate or Higher (age 25+)
82.7%
Bachelor's Degree or Higher (age 25+)
15.6%

Population by Age

GroupPeopleShare
Under 1827,13023.4%
18 to 6469,01259.5%
65 and over19,82917.1%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)9,2298.0%
White, not Hispanic70,98061.2%
Black, not Hispanic27,45923.7%
Asian, not Hispanic1,3131.1%
American Indian / Alaska Native, not Hispanic1,9231.7%
Native Hawaiian / Pacific Islander, not Hispanic70.0%
Some other race, not Hispanic4240.4%
Two or more races, not Hispanic4,6364.0%

Source: U.S. Census Bureau, American Community Survey 2020-2024 ACS 5-year estimates (tables B01001, B01002, B01003, B03002, B15003, B19013) for this state legislative district. Estimates are survey-based; ± figures are 90% margins of error.

Citizen Voting Age Population

Total Citizen Population
113,449
Citizen Voting Age Population (CVAP)
86,543

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic106,08393.5%
Hispanic7,3676.5%
White72,00363.5%
Black27,41724.2%
Asian1,0200.9%
American Indian / Alaska Native1,9571.7%
Native Hawaiian / Pacific Islander100.0%
Two or More Races8290.7%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic82,81695.7%
Hispanic3,7324.3%
White58,09667.1%
Black21,13924.4%
Asian1,0501.2%
American Indian / Alaska Native2,3082.7%
Native Hawaiian / Pacific Islander80.0%
Two or More Races3950.5%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).