Plum Island Neighborhood, San Mateo
Crime Rate & Statistics
One of the safest neighborhoods — significantly below-average crime
Safety at a Glance
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in San Mateo
Is Plum Island Safe?
Yes — this neighborhood is extremely safe. Plum Island in San Mateo, CA has a safety grade of A+. The overall crime index is 21, which is 79% below the national average of 100.
Compared to the San Mateo average (crime index 66), Plum Island is 45% lower in overall crime. This neighborhood is significantly safer than San Mateo as a whole, making it an attractive option for safety-conscious residents.
Looking at specific crime types, robbery is the most elevated concern (index: 50, 50% below average), while murder is the lowest risk (index: 9).
Plum Island Crime Breakdown
Crime indices compared to national average (100) and San Mateo city average. Higher values mean more crime.
| Crime Type | Index | vs National | Risk Level | |
|---|---|---|---|---|
| Violent Crime | ||||
|
Murder
|
9 | -91% | Low | |
|
Assault
|
12 | -88% | Low | |
|
Robbery
|
50 | -50% | Low | |
|
Rape
|
37 | -63% | Low | |
| Property Crime | ||||
|
Burglary
|
17 | -83% | Low | |
|
Larceny / Theft
|
32 | -68% | Low | |
|
Vehicle Theft
|
23 | -77% | Low | |
How Plum Island Compares
Crime index by category: Plum Island vs San Mateo average vs national average.
Crime by Category
Overall Crime Comparison
Plum Island Crime Map
Crime heatmap based on block-group level data. Red areas indicate higher crime density.
See the crime score for a specific address
Plum Island Demographics & Context
Education
Housing
Racial Demographics
Nearby Neighborhoods
Frequently Asked Questions
What is the crime rate in Plum Island, San Mateo?
Plum Island in San Mateo, CA has a crime safety grade of A+ as of 2026. The overall crime index is 21, which is 79% below the national average. Compared to the San Mateo average, crime in Plum Island is 45% lower.
Is Plum Island a safe neighborhood in San Mateo?
Plum Island is generally considered a safe neighborhood in San Mateo, earning a crime grade of A+. The highest concern is Robbery (index: 50), while Murder is the lowest risk (index: 9).
How does Plum Island compare to the rest of San Mateo?
Plum Island's overall crime index is 21, compared to the San Mateo average of 66. This means crime in Plum Island is 45% lower than the city average. For violent crime, the index is 27, and for property crime it is 24. 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 Plum Island?
The most prevalent crime type in Plum Island is Robbery, with a crime index of 50 (50% below the national average). Violent crime is a particular concern in this neighborhood relative to property crime.
What are safer neighborhoods near Plum Island?
Nearby neighborhoods with good safety ratings include Harbor Side, Marina Point, The Islands and Sea Colony. These areas are close to Plum Island and offer lower crime rates, making them worth considering for residents who prioritize safety.
What are the demographics of Plum Island?
Plum Island has a population of approximately 159. The median household income is $165,796. The median home value is $2,450,257. Research shows that economic factors can correlate with crime rates, though many other variables play a role in neighborhood safety.
How does Plum Island crime compare to the national average?
Plum Island's overall crime rate is 79% below the national average (index 21 vs 100). 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.