Overview

St. Mary Parish, LA (shown in white) has 558.53 mi² of land area and 561.2 mi² of water resources. The county is bordered by:

• Assumption Parish, LA
• Iberia Parish, LA
• St. Martin Parish, LA
• Terrebonne Parish, LA

The county's elevations range from a low of 0' to a high of 72.2', with a weighted average of 1.2' above sea level.

Temperatures range from average lows around 43.2°F to average highs around 90.8°F. A year-round daily temperature averages 69.7°F. Average annual precipation is 64.3". With these temperatures and precipation, the majority of the county scores as an 9A using the USDA Plant Hardiness Zone Map (the standard by which gardeners and growers can determine which perennial plants are most likely to thrive in a location).

The estimated population of St. Mary Parish is 48,259 with 18,867 households. These households are spread across 12 unique municipalties (not all shown).