1. States
  2. /California
  3. /San Diego County
  4. /San Marcos
MSASan Diego-Chula Vista-Carlsbad#8/18 Population
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San Marcos is a city in San Diego County, California, with a population of approximately 94,833.

Population94,882
Median Home Value$868,000
Median Income$105,286
Area24.57 sq mi

How San Marcos Ranks

#2
Safest Citiesin San Diego County
6.2 total crimes per 1k
#3
Fastest Growing Citiesin San Diego County
+0.9%

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NewsAPR 14, 2026

San Marcos Man Drowns In Colorado River

San Marcos Man Drowns In Colorado River Patch

PatchRead article ↗
NewsAPR 14, 2026

San Marcos man falls from boat, drowns while retrieving hat in AZ’s Colorado River

San Marcos man falls from boat, drowns while retrieving hat in AZ’s Colorado River fox5sandiego.com

fox5sandiego.comRead article ↗
NewsAPR 06, 2026

San Marcos, California Is Crushing Its Housing Goals

San Marcos, California Is Crushing Its Housing Goals AP News

AP NewsRead article ↗

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