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San Mateo County
| Measures, data | 2009 | 2010 |
|---|---|---|
| Total adult population in prison (number) as of December 31 | 1,659 | 1,518 |
| Imprisonments per 1,000 annual adult felony arrests | 348.6 | 310.9 |
| State imprisonment rate per 1,000 adult felony arrests (average) | 417.7 | 407.1 |
| County imprisonment rate as percent of state average (=100%), arrest based | 83% | 76% |
| County imprisonments if rate equaled state average, projected (number) | 1,988 | 1,987 |
| County actual imprisonments minus projected imprisonments at average state rate (number) | -329 | -469 |
| Costs added (saved) from excessive (lower) imprisonments (millions of dollars/year) | -$15.5 | -$21.5 |
| County imprisonment rates in state prisons | ||
| Men imprisoned per 1,000 male felony arrests | 406.7 | 370.6 |
| Women imprisoned per 1,000 female felony arrests | 108.8 | 86.7 |
| Total adult imprisonments per 100,000/population age 18-69 | 349.6 | 309.2 |
| Men imprisoned per 100,000 males age 18-69 | 651.5 | 586.5 |
| Women imprisoned per 100,000 females age 18-69 | 42.9 | 36.0 |
| County imprisonment rates in state prisons by offense | ||
| Imprisonments for violent offenses per 1,000 violent felony arrests | 816.2 | 844.4 |
| Imprisonments for property offenses per 1,000 property felony arrests | 248.4 | 209.5 |
| Imprisonments for drug offenses per 1,000 drug felony arrests | 176.2 | 122.9 |
| Imprisonments for violent offenses per 100,000 population | 140.7 | 136.7 |
| Imprisonments for property offenses per 100,000 population | 43.1 | 37.4 |
| Imprisonments for drug offenses per 100,000 population | 34.3 | 26.9 |
| Imprisonments for drug possession offenses per 100,000 population | 13.8 | 12.0 |
| Imprisonments for marijuana offenses per 100,000 population | 1.1 | 1.3 |
| Imprisonments for strike offenses per 100,000 population | 56.8 | 55.4 |
| Imprisonments for 3rd strikes per 100,000 population | 12.4 | 12.5 |
| Imprisonments for 2nd strikes per 100,000 population | 44.4 | 42.9 |
| Change in imprisonment rates per adult felony arrest compared to 2009 | N/A | -11% |
| County new felon admissions to state prisons | ||
| New felon admissions to prison by race/ethnicity, all races | 674 | 576 |
| New felon admissions per 1,000 adult felony arrests | 141.6 | 118.0 |
| New felon admissions, statewide average | 156.0 | 148.7 |
| New felon admissions per 1,000 felonies as a percent of the state average (=100%) | 91% | 79% |
| New felon admissions per 100,000 population, all races | 94.1 | 80.2 |
| White, not Latino, new felon admissions per 100,000 whites | N/A | 52.0 |
| Latino new felon admissions per 100,000 Latinos | N/A | 95.3 |
| Black new felon admissions per 100,000 African Americans | N/A | 842.1 |
| Asian/other new felon admissions per 100,000 Asian/other population | N/A | 40.3 |
| County adult jail incarceration rates | ||
| County adult jail incarcerations, average daily population, December | 1,024 | 1,009 |
| Percent of jail population that is unsentenced | 63% | 72% |
| County jail populations per 1,000 adult felony arrests | 215.2 | 206.7 |
| Jail incarceration rate, state average | 186.6 | 176.5 |
| County jail incarceration rate per 1,000 felony arrests as a percent of the state average (=100%) | 115% | 117% |
| Men jailed per 1,000 male felony arrests | 238.3 | 229.5 |
| Women jailed per 1,000 female felony arrests | 119.6 | 120.9 |
| County jail populations per 100,000 population age 18-69 | 215.8 | 205.5 |
| Men jailed per 100,000 males age 18-69 | 381.8 | 363.2 |
| Women jailed per 100,000 females age 18-69 | 47.1 | 50.2 |
| County total adult incarcerations (state prisons + local jails) as of December | ||
| Total adult population incarcerated | 2,683 | 2,527 |
| Total adult incarceration rate per 1,000 adult felony arrests | 563.8 | 517.6 |
| Total incarceration rate, state average | 604.3 | 583.5 |
| Total adult incarceration rate as a percent of the state average (=100%) | 93% | 89% |
| Total adult male incarceration rate per 1,000 adult male felony arrests | 645.0 | 600.1 |
| Total adult female incarceration rate per 1,000 adult female felony arrests | 228.4 | 207.6 |
| Total adult male incarceration rate per 100,000 males age 18-69 | 1,033.3 | 949.7 |
| Total adult female incarceration rate per 100,000 females age 18-69 | 90.0 | 86.2 |
| Percent of incarcerated adult population held locally | 38% | 40% |
| Raw numbers, county prisoners in state prisons | ||
| Men imprisoned | 1,558 | 1,429 |
| Women imprisoned | 101 | 89 |
| Imprisonments for violent felonies | 1,008 | 982 |
| Imprisonments for property felonies | 309 | 269 |
| Imprisonments for drug felonies | 246 | 193 |
| Imprisonments for drug possession offenses | 99 | 86 |
| Imprisonments for marijuana offenses | 8 | 9 |
| Imprisonments for strike offenses | 407 | 398 |
| Imprisonments for 3rd strikes | 89 | 90 |
| Imprisonments for 2nd strikes | 318 | 308 |
| Raw numbers, county new felon admissions to state prisons, calendar year | ||
| New felon admissions to prison, White, not Latino | N/A | 158 |
| New felon admissions to prison, Latino | N/A | 174 |
| New felon admissions to prison, Black | N/A | 158 |
| New felon admissions to prison, Asian/all other | N/A | 86 |
| Raw numbers, county jail incarcerations, ADP as of December | N/A | N/A |
| Jailed, unsentenced | 649 | 728 |
| Jailed, sentenced | 375 | 281 |
| Men jailed | 913 | 885 |
| Women jailed | 111 | 124 |
| Raw numbers, total county incarcerations (state prison + local jails) | N/A | N/A |
| Total incarcerated (state prison + local jails), adult males | 2,471 | 2,314 |
| Total incarcerated (state prison + local jails), adult females | 212 | 213 |
| County crime rates and adult arrest rates | ||
| Part I crime rate per 100,000 population (offenses reported to police) | 1,500.7 | 1,449.6 |
| Violent crime rate per 100,000 population | 289.3 | 249.8 |
| Property crime rate per 100,000 population | 1,211.4 | 1,199.8 |
| Adult felony arrest rate per 100,000 population age 18-69 | 1,002.7 | 994.5 |
| Violent crime arrest rate | 260.2 | 236.9 |
| Property crime arrest rate | 262.1 | 261.6 |
| Drug offense arrest rate | 294.1 | 320.0 |
| Male felony arrest rate | 1,601.9 | 1,582.5 |
| Female felony arrest rate | 394.1 | 415.0 |
| Raw numbers, county crimes reported to police, adult felony arrests, and populations | ||
| Part I crimes reported to police (number) | 10,749 | 10,415 |
| Violent crimes reported | 2,072 | 1,795 |
| Property crimes reported | 8,677 | 8,620 |
| Adult felony arrests, total (number) | 4,759 | 4,882 |
| Violent felony arrests | 1,235 | 1,163 |
| Property felony arrests | 1,244 | 1,284 |
| Drug felony arrests | 1,396 | 1,571 |
| Male felony arrests | 3,831 | 3,856 |
| Female felony arrests | 928 | 1,026 |
| Total county population, all ages (number) | 716,264 | 718,451 |
| White, not Latino population | N/A | 303,609 |
| Latino population | N/A | 182,502 |
| Black population | N/A | 18,763 |
| Asian/other population | N/A | 213,577 |
| Total adult population, age 18-69 | 474,607 | 490,902 |
| Male population, age 18-69 | 239,148 | 243,661 |
| Female population, age 18-69 | 235,459 | 247,241 |
| At Legislative Analyst-estimated cost per prisoner per year | $47,102 | $45,828 |
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Go to the California Sentencing Institute and click on the Interactive County Map to view the rates of adult arrests and imprisonments by offense, race, and sex.