Overview

St. Tammany Parish, LA (shown in white) has 845.27 mi² of land area and 250.35 mi² of water resources. The county is bordered by:

• Hancock County, MS
• Jefferson Parish, LA
• Orleans Parish, LA
• Pearl River County, MS
• St. Bernard Parish, LA
• St. John the Baptist Parish, LA
• Tangipahoa Parish, LA
• Washington Parish, LA

The county's elevations range from a low of 0' to a high of 219.8', with a weighted average of 36.3' above sea level.

Temperatures range from average lows around 40.7°F to average highs around 91.3°F. A year-round daily temperature averages 68.8°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. Tammany Parish is 280,171 with 108,063 households. These households are spread across 11 unique municipalties (not all shown).