| City: | Mermentau, Louisiana |
| Parish: | Acadia Parish |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 1:40:06 AM |
| Population: | 545 [See All] |
| Area Code: | 337 |
| Classification: | PO Box |
| Coordinates: | 30.1973, -92.5585 |
| Land Area: | 1.77 sq mi |
| Quick Link: |
Mermentau sits along Highway 90 in Acadia Parish, Louisiana. It's a PO Box Only Zone, meaning there's no alternative mail delivery for the 545 residents who live here. Everyone gets their mail at the post office or through the two rural routes that serve the surrounding farmland.
The town maintains 270 PO Boxes for 228 households. That 1.18x ratio shows the post office also serves farms and businesses beyond the town limits. With 15 local businesses employing 313 workers, this small agricultural community punches above its weight economically. Many of those jobs are in transportation and warehousing, likely tied to the rice and crawfish industries that define Acadia Parish.
Demographics show a settled, established community. Median age is 45.9 years, and 73% of residents own their homes. Household income runs high at $112,864, though home values stay modest at $55,900. Over a third of adults (36.5%) hold bachelor's degrees, and 21.5% work from home. These numbers suggest a community of agricultural managers, business owners, and professionals who've chosen rural life.
Street names tell the story of a classic Louisiana small town: numbered streets (4th, 7th, 12th, 13th) form a simple grid, while Drum Road and Port Road hint at the waterways that shaped this region. The Mermentau River, which gives the town its name, drains much of southwestern Louisiana's rice country.
Numbered streets form a small-town grid, while Drum Road and Port Road reference the waterways and shipping that built this community.
ZIP Code 70556 has 545 residents and 228 households (average 2.39 persons per household). The median age is 45.9 years, significantly older than the state (38.1) and significantly older than the nation (38.8). The gender split is 47.0% male and 53.0% female, which is slightly lower than the national male share (49.1%), making this a female-majority area. Largest groups are White (80.0%, much higher than the state average of 57.1% and well above the national average of 61.6%) and Black or African American (13.2%, much lower than the state average of 31.4%); Hispanic or Latino residents make up 1.5%, which is much lower than the national average (18.7%).
Explore More:Population Over TimeBy Age & GenderBy RaceBy GenderNativity & Citizenship
| 2020 Population: | 545Source: Census DHC |
| 2024 ACS Population Estimate: | 570Source: Census ACS |
| 2026 ZC Population Estimate: | 0Source: ZIP-Codes.com |
| Population Density: | 307.9 people per sq mile |
| Average Income: | $112,864Source: Census ACS |
| Households: | 228Source: Census DHC |
| Average House Value: | $55,900Source: Census ACS |
| Persons Per Household: | 2.39Source: Census DHC |
| Average Family Size: | 3.07Source: Census ACS |
| Group | 2010 | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Census ACS Population Estimate | -- | 444 | 292 | 278 | 391 | 318 | 346 | 293 | 316 | 309 | 362 | 804 | 644 | 570 |
| Decennial Census | 331 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 545 | -- | -- | -- |
Median Age: 45.9
Male Median Age: 44.7
Female Median Age: 46.7
| Group | < 5 | 5-9 | 10-14 | 15-19 | 20-24 | 25-29 | 30-34 | 35-39 | 40-44 | 45-49 | 50-54 | 55-59 | 60-64 | 65-69 | 70-74 | 75-79 | 80-84 | 85+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Male | 11 | 13 | 24 | 28 | 16 | 10 | 7 | 7 | 13 | 17 | 15 | 28 | 17 | 9 | 15 | 8 | 12 | 6 |
| Female | 16 | 17 | 16 | 17 | 14 | 14 | 16 | 16 | 13 | 18 | 14 | 24 | 31 | 17 | 17 | 10 | 9 | 10 |
| Total | 27 | 30 | 40 | 45 | 30 | 24 | 23 | 23 | 26 | 35 | 29 | 52 | 48 | 26 | 32 | 18 | 21 | 16 |
| White: | 436 | 84.01% |
| Black: | 72 | 13.87% |
| Hispanic:* | 8 | 1.54% |
| Asian: | 0 | 0% |
| American Indian: | 2 | 0.39% |
| Hawaiian: | 0 | 0% |
| Other: | 1 | 0.19% |
| Total: | 519 | 100% |
| Gender | Count | % | Median Age |
|---|---|---|---|
| Males: | 256 | 46.97% | 44.7 years |
| Females: | 289 | 53.03% | 46.7 years |
| Total: | 545 | 100% | 45.9 years |
| Native, born in the United States: | 570 | 100.00% |
| Native, born in PR, Island Areas, or abroad: | 0 | 0.00% |
| Foreign born, naturalized U.S. citizen: | 0 | 0.00% |
| Foreign born, not a U.S. citizen: | 0 | 0.00% |
| Total Population: | 570 | 100% |
| Total Native Population: | 570 | 100.00% |
| Total Foreign-born Population: | 0 | 0.00% |
In 2023, the Median household income is $112,864, which is much higher than the state median ($60,023), is up $83,305 (281.8%) since 2011 and above its 2019 pre-pandemic level by $90,591. Family households earn a median of $113,311 versus $36,250 for nonfamily households (a difference of $77,061). By gender, male median income is $52,813 and female is $35,417, which is much lower than the national female median ($53,445), with a current gap of $17,396 that has widened from 2011 to 2023. The labor-force participation rate is 27.0%, which is much lower than the national rate (63.5%). The unemployment rate is 10.3%, which is markedly higher than the national rate (5.2%). The largest occupation group is Service (29.0%).
Explore More:Income Over TimeHousehold IncomeEmployment StatusBy Occupation
| Income Type | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Household Income | $29,559 | $28,021 | $22,604 | $31,125 | $58,750 | $0 | $0 | $0 | $22,273 | $37,708 | $100,122 | $110,213 | $112,864 |
| Median Family Income | $36,875 | $43,092 | $32,266 | $41,667 | $46,818 | $46,875 | $73,125 | $0 | $36,071 | $48,618 | $100,518 | $110,694 | $113,311 |
| Median NonFamily Income | $15,781 | $15,833 | $11,500 | $10,833 | $11,429 | $12,500 | $10,385 | $11,250 | $12,500 | $12,875 | $22,083 | $24,063 | $36,250 |
| Median Male Income | $26,953 | $36,450 | $40,156 | $41,597 | $41,136 | $43,188 | $66,250 | $59,375 | $30,781 | $31,875 | $49,286 | $51,875 | $52,813 |
| Median Female Income | $23,125 | $17,222 | $23,281 | $26,250 | $31,979 | $35,341 | $33,750 | $32,000 | $36,964 | $35,938 | $37,708 | $33,958 | $35,417 |
| Employed: | 131 | 24.26% |
| Unemployed: | 15 | 2.78% |
| Not In Labor Force: | 394 | 72.96% |
| Total: | 540 | 100% |
| Management, business, science, and arts: | 6 | 4.58% |
| Service: | 38 | 29.01% |
| Sales and Office: | 24 | 18.32% |
| Natural resources, construction, and maintenance: | 30 | 22.90% |
| Production, transportation, and material moving: | 33 | 25.19% |
| Total Civilian Employed Population: | 131 | 100% |
In 2023, the median home value is $55,900, which is well under the national median ($303,400), is up $5,500 (10.91%) since 2011 and below its 2019 pre-pandemic level by $20,200. The median gross rent is $490, which is considerably lower than the national median ($1,348), is up $75 (18.07%) since 2011 and above its 2019 pre-pandemic level by $215. Of occupied housing, owners make up 81.33% (3.11% with a mortgage, 96.89% free-and-clear) and renters 18.67% - making this ZIP Code more home ownership than the state and under national rental averages. The vacancy rate is 9.97%, which is far lower than the state rate (14.84%).
Explore More:Compare Home ValueHome Value Over TimeRent & Over TimeHousing Occupancy
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Home Value | $50,400 | $56,700 | $53,000 | $64,200 | $66,700 | $71,400 | $76,800 | $73,200 | $76,100 | $48,300 | $46,200 | $56,800 | $55,900 |
| Less than $500: | 26 | 44.07% |
| $500 to $999: | 24 | 40.68% |
| $1,000 to $1,499: | 0 | 0.00% |
| $1,500 to $1,999: | 0 | 0.00% |
| $2,000 to $2,499: | 0 | 0.00% |
| $2,500 to $2,999: | 0 | 0.00% |
| $3,000 or more: | 0 | 0.00% |
| No Rent: | 9 | 15.25% |
| Total: | 59 | 100% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Rent | $415 | $404 | $314 | $288 | $244 | $256 | $256 | $246 | $275 | $325 | $471 | $463 | $490 |
| Owner Occupied (with mortgage): | 8 | 2.53% |
| Owner Occupied (free and clear, no mortgage): | 249 | 78.80% |
| Renter Occupied: | 59 | 18.67% |
| Total Occupied Housing Units: | 316 | 100% |
| Occupied Housing Units: | 316 | 90.03% |
| Vacant Housing Units (not graphed): | 35 | 9.97% |
| Total Housing Units: | 351 | 100% |
| Single-Family Units: | 282 | 80.34% |
| Multi-Family Units: | 59 | 16.81% |
| Other Units: | 10 | 2.85% |
| Total Housing Units: | 351 | 100% |
In 2023, 36.50% of adults (25+) have a bachelor's degree or higher, which is on par with the state rate (26.60%). High school or higher is 79.70%, which is comparable to the national rate (89.40%). The uninsured rate is 0.50%, which is far lower than the national rate (8.60%). Private coverage is 37.40%, which is falls below the national rate (67.30%). Public coverage is 76.80%, which is far higher than the national rate (36.30%). The share of people in poverty is 7.40%, which is on par with the state rate (14.20%), down 2.50 percentage points since 2011 and below its 2019 pre-pandemic level by 18.80 percentage points. This suggests a positive shift in the local economic and social landscape - higher incomes, steadier consumer demand, and a strengthening tax base. Among residents ages 3+, the largest enrollment group is kindergarten (45.95%). College enrollment is 27.03%, which is on par with the state rate (24.00%), meaning the community mirrors broader higher-education participation.
Explore More:Educational AttainmentHealth InsurancePoverty Over TimeSchool Enrollment
| Less than 9th grade: | 54 | 10.65% |
| 9th to 12th grade, no diploma: | 49 | 9.66% |
| High school graduate (includes equivalency): | 126 | 24.85% |
| Some college, no degree: | 77 | 15.19% |
| Associate's degree: | 16 | 3.16% |
| Bachelor's degree: | 177 | 34.91% |
| Graduate or professional degree: | 8 | 1.58% |
| Total: | 507 | 100% |
| High school or higher: | 404 | 79.68% |
| Bachelor's degree or higher: | 185 | 36.49% |
| Private Insurance: | 213 | 32.57% |
| Public Insurance: | 438 | 66.97% |
| No Insurance: | 3 | 0.46% |
| Total: | 654 | 100% |
| Has Health Insurance: | 651 | 99.54% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % of People in Poverty | 9.9% | 12.0% | 21.5% | 20.2% | 17.5% | 23.3% | 28.8% | 28.2% | 26.2% | 19.1% | 10.7% | 9.4% | 7.4% |
Note: Counts of Families & People in poverty are not published at the ZIP Code level due to small sample sizes. Percentages shown are survey estimates from the American Community Survey (ACS). They may differ from official poverty statistics. The U.S. Census Bureau defines poverty status by comparing a family's or individual's total income with federal poverty thresholds that vary by family size and composition.
| Nursery School, Preschool: | 0 | 0.00% |
| Kindergarten: | 17 | 45.95% |
| Elementary school (grades 1-8): | 10 | 27.03% |
| High school (grades 9-12): | 0 | 0.00% |
| College or graduate school: | 10 | 27.03% |
| Total: | 37 | 100% |
| Early Childhood: | 17 | 45.95% |
| K-12 (Primary & Secondary School): | 27 | 72.97% |
ZIP Code 70556 supports both business and residential activity. According to the Business Census (2024), there are 16 business establishments, employing about 309 people with an annual payroll of $16,067,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 867Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 16Source: CBP |
| 1st Quarter Payroll: | $3,554,000Source: CBP |
| Annual Payroll: | $16,067,000Source: CBP |
| # of Employees: | 309Source: CBP |
ZIP Code 70556 is located in Acadia Parish, Louisiana, within the Lafayette, LA Metropolitan Statistical Area (CBSA 29180) and Louisiana's 3rd Congressional District. This Metro area has a population of 410,883 people, about 0.13% of whom live in ZIP Code 70556. It covers 1.77 sq mi of land and a water area of 0.168 sq mi.
| CBSA Name: | Lafayette, LASource: Census |
| CBSA Number: | 29180Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 410,883Source: Census |
| MSA: | Lafayette, LA MSASource: Census |
| Land Area: | 1.77 sq miSource: Census |
| Water Area: | 0.168 sq miSource: Census |
| Congressional District: | 03Source: USPS |
| Congressional Land Area: | 6983.32 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 2249870Source: Census |
| Place Name: | Mermentau village; LouisianaSource: Census |
ZIP Code 70556 is in the Acadia Parish School District, which serves grades Pre-Kindergarten thru 12th. There are 1 public school(s) in this ZIP Code, and we have located 3 private school(s). It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on January 1, 2026.