78666 Zip Code, San Marcos
Crime Rate & Statistics
Very safe zip code — well below-average crime rates
Safer than 0% of zip codes in San Marcos
Safety at a Glance
Check a specific address
in San Marcos
Is 78666 a Safe Zip Code?
Yes — this zip code is very safe. Zip code 78666 in San Marcos, TX has a safety grade of A. The overall crime index is 124, which is 24% above the national average of 100. This zip code is safer than 0% of zip codes in San Marcos.
Compared to the San Marcos average (crime index 136), zip code 78666 is 12% lower in overall crime.
Looking at specific crime types, rape is the most elevated concern (index: 144, 44% above average), while assault is the lowest risk (index: 127).
78666 Crime Breakdown
Crime indices compared to national average (100) and San Marcos city average. Higher values mean more crime.
| Crime Type | Index | vs National | Risk Level | |
|---|---|---|---|---|
| Violent Crime | ||||
|
Murder
|
137 | +37% | Moderate | |
|
Assault
|
127 | +27% | Moderate | |
|
Robbery
|
135 | +35% | Moderate | |
|
Rape
|
144 | +44% | Moderate | |
| Property Crime | ||||
|
Burglary
|
132 | +32% | Moderate | |
|
Larceny / Theft
|
139 | +39% | Moderate | |
|
Vehicle Theft
|
140 | +40% | Moderate | |
How 78666 Compares
Crime index by category: 78666 vs San Marcos average vs national average.
Crime by Category
Overall Crime Comparison
78666 Crime Map
Crime heatmap based on block-group level data. Red areas indicate higher crime density.
See the crime score for a specific address
78666 Demographics & Context
Education
Housing
Racial Demographics
Frequently Asked Questions
What is the crime rate in Zip code 78666, San Marcos?
Zip code 78666 in San Marcos, TX has a crime safety grade of A as of 2026. The overall crime index is 124, which is 24% above the national average. Compared to the San Marcos average, crime in Zip code 78666 is 12% lower. Zip code 78666 is safer than 0% of neighborhoods in San Marcos.
Is Zip code 78666 a safe neighborhood in San Marcos?
Zip code 78666 is generally considered a safe neighborhood in San Marcos, earning a crime grade of A. The highest concern is Rape (index: 144), while Assault is the lowest risk (index: 127). It is one of the safest neighborhoods in San Marcos.
How does Zip code 78666 compare to the rest of San Marcos?
Zip code 78666's overall crime index is 124, compared to the San Marcos average of 136. This means crime in Zip code 78666 is 12% lower than the city average. For violent crime, the index is 136, and for property crime it is 137. However, crime can vary block by block, so checking the crime map for specific streets is recommended.
What type of crime is most common in Zip code 78666?
The most prevalent crime type in Zip code 78666 is Rape, with a crime index of 144 (44% above the national average). Overall, property crime is more prevalent than violent crime in this neighborhood, which is consistent with national trends.
What are the demographics of Zip code 78666?
Zip code 78666 has a population of approximately 89,692. The median household income is $48,432. The median home value is $373,835. Research shows that economic factors can correlate with crime rates, though many other variables play a role in neighborhood safety.
How does Zip code 78666 crime compare to the national average?
Zip code 78666's overall crime rate is 24% above the national average (index 124 vs 100). Within San Marcos, it is safer than 0% of neighborhoods. For the most accurate picture, review the per-crime-type breakdown above, as some categories may differ significantly from the overall trend.
Crime data sourced from FBI UCR reports and local law enforcement agencies. Crime indices use 100 as the national average. Updated April 2026.