Market insights · Louisiana
St. Mary Parish, LA: growth, migration and housing
St. Mary Parish has 46,552 residents, down 5.3% since 2020 (-0.9% in the last year). In 2022–2023, 739 households moved in and 1,042 moved out (-303 net), while a net $14.6M of income left. Median household income is $52,576, the median home $138,900 and median rent $848 a month.
In Louisiana: 47th of 64 counties for 5-year population growth · 59th of 64 counties for net in-migration (per resident) · 35th of 64 counties for median household income · 42nd of 64 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to St. Mary Parish, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Iberia Parish, LA | 95 | $3.2M |
| Lafayette Parish, LA | 80 | $3.0M |
| Terrebonne Parish, LA | 73 | $2.9M |
| Assumption Parish, LA | 70 | $2.4M |
| Lafourche Parish, LA | 45 | $1.5M |
| East Baton Rouge Parish, LA | 30 | $1.2M |
| Harris County, TX | 29 | $1.2M |
| St. Martin Parish, LA | 27 | $1.3M |
Where leavers went
Top counties by households leaving St. Mary Parish, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Iberia Parish, LA | 143 | $5.3M |
| Lafayette Parish, LA | 143 | $7.0M |
| Terrebonne Parish, LA | 78 | $2.7M |
| Assumption Parish, LA | 64 | $2.2M |
| Lafourche Parish, LA | 52 | $2.3M |
| Harris County, TX | 49 | $3.0M |
| East Baton Rouge Parish, LA | 40 | $2.1M |
| St. Martin Parish, LA | 31 | $1.4M |
BizyFi in St. Mary Parish
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Sources: U.S. Census Bureau population estimates (vintage 2025), American Community Survey 5-year (2024), and IRS Statistics of Income county-to-county migration data (2022–2023). Migration counts are tax returns (roughly households) moving between U.S. counties; the IRS suppresses very small flows. Growth rates, per-1,000 figures, rent share and state ranks are BizyFi calculations. Data updated 2026-10-17. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.