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St. Louis County, MO (shown in white) has 507.99 mi² of land area and 15.37 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 377.3' to a high of 899', with a weighted average of 544' above sea level.
Temperatures range from average lows around 23°F to average highs around 89.7°F. A year-round daily temperature averages 57.1°F. Average annual precipation is 44.4". With these temperatures and precipation, the majority of the county scores as an 6B 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. Louis County is 994,049 with 406,818 households. These households are spread across 98 unique municipalties (not all shown).
