| Statistic | Reportedincidents | /100k people | Union City/100k people | California/100k people | National/100k people |
| Total crime | 1,691 | n/a (estimate) | 2,643 | 2,564 | 2,119 |
| Murder | 2 | n/a | 3.1 | 4.5 | 5.0 |
| Rape | 11 | n/a | 17.2 | 36.6 | 37.5 |
| Robbery | 77 | n/a | 120.4 | 119.1 | 60.6 |
| Assault | 171 | n/a | 267.3 | 325.8 | 256.1 |
| Violent crime | 261 | n/a (estimate) | 408 | 486 | 359 |
| Burglary | 187 | n/a | 292.3 | 305.8 | 229.2 |
| Theft | 812 | n/a | 1,269.2 | 1,345.2 | 1,272.1 |
| Vehicle theft | 431 | n/a | 673.7 | 427.5 | 258.8 |
| Property crime | 1,430 | n/a (estimate) | 2,235 | 2,078 | 1,760 |

Looking at the most recent crime report, the crime rate in Union City is 24.7% higher than the national average. These crimes fall into two primary categories: violent and property. Violent crimes encompass murder, rape, robbery and assault, while property crimes involve theft, vehicle theft and burglary. In Union City, there were 261 reported violent crimes, equivalent to 408 per 100,000 individuals, 13.6% higher than the national average. Additionally, there were 1430 property crimes, amounting to 2235 per 100,000 residents, 27% higher than the U.S. average.
For violent crimes per 100,000 people, Union City has a rate of violent crime that is very close to the national average. There were a total of 408 violent crimes, while the national average reported 359. This is an indication that the level of crime is essentially on par with all other cities.
The surge in vehicle thefts is a concerning trend across the United States, and Union City is no exception, experiencing one of the nation's highest vehicle theft rates. Last year, Union City reported a total of 431 vehicle thefts, resulting in 674 stolen vehicles per 100,000 people. This places the city in the lowest 10% tier among all cities, indicating that 90% of cities have less stolen vehicles. The probability of a vehicle being stolen stands at 1 in 149, underscoring the need for heightened vigilance and security measures.
AreaVibes has conducted polls asking local residents if they feel safe living in Union City. Based on the results of the surveys (39 responses), 41% of people felt that there was very little crime in Union City and felt safe walking alone at night. While 59% of people felt that it was not a safe place to live and did not feel safe walking alone at night.
Before you decide to relocate, it’s always good to ask yourself “Is Union City a safe place to live?” Although the answer might not be that simple, as some areas are safer than others, getting a good feel for the overall rate of crime can definitely be helpful. Overall, the Union City crime rate is 25% higher than the national average. If we break that down daily, that translates into 4.63 crimes per day - 0.72 violent crimes and 3.92 property crimes.
Year-over-year crime data allows residents and potential residents to assess the crime in Union City. A decrease in crime rates may indicate improving safety, while an increase could raise concerns. The year-over-year crime rate in Union City has decreased by 20.2%. Violent crimes have increased by 17.6%, while property crimes have decreased by 24.6%. By comparing crime rates from one year to the next, authorities and communities can identify trends and patterns in criminal activity. This helps in understanding whether crime is increasing, decreasing, or remaining stable over time.
If employment opportunities are limited or if many jobs offer low wages, it can lead to higher rates of unemployment and underemployment, which could lead to an increase in Union City crime rates. Areas where individuals struggle with unemployment or low wages, may be more susceptible to an increase in criminal activities as a result of financial insecurity. While lower rates of unemployment or a surplus of job opportunities could lead to a decrease in crime as their basic needs are being met. Union City has an unemployment rate of 2.7%, compared to a national average of 4.9%.
Highly populated regions typically encompass expansive urban hubs teeming with diverse economic prospects. Within these areas, income inequality can be exacerbated, giving rise to enclaves of poverty amid affluence. Communities marked by economic disparities may contend with heightened property crimes, and in certain instances, violent crimes. Conversely, regions characterized by low population density often exhibit lower Union City crime rates. For instance, in Union City, the population density stands at 3949.4 people per square mile, diverging from the national average of 90.6 people per square mile.
In Union City, the average rental rates are $3,491 per month, compared to the national average of $1,444. Rapid increases in rental costs can lead to neighborhood instability as residents are forced to move frequently in search of more affordable housing. This transience can weaken community bonds and hinder the establishment of social support networks, which can indirectly contribute to crime. While affordable rent and areas with higher income per capita, allow for long term renters and community bonds to the formed, therefore reducing crime rates on the long term.

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| Item | Union City | California | National |
| Law enforcement employees (officers & civilians) | 98 | 51,506 | 558,732 |
| Police officers & civilians /1000 residents | 1.4 | 3.6 | 3.3 |
| State | Total offenders | California /100K | National /100K |
| California | 79,891 | 232 | 266 |
| City | Population | Violent crime/100k people | Property crime/100k people | Total crime/100k people |
| Ladera, CA | 1,385 | 68 | 292 | 360 |
| West Menlo Park, CA | 3,720 | 93 | 396 | 488 |
| Danville, CA | 44,933 | 63 | 584 | 647 |
| Emerald Lake Hills, CA | 4,893 | 126 | 540 | 666 |
| Foster City, CA | 33,056 | 69 | 669 | 739 |
| Woodside, CA | 5,593 | 158 | 676 | 834 |
| Camino Tassajara, CA | 5,870 | 158 | 676 | 834 |
| Union City, CA | 75,067 | 408 | 2,235 | 2,643 |
| City | Population | Violent crime/100k people | Property crime/100k people | Total crime/100k people |
| Arlington Heights, IL | 75,071 | 50 | 880 | 930 |
| Missoula, MT | 74,994 | 597 | 3,629 | 4,226 |
| Milpitas, CA | 75,182 | 314 | 3,183 | 3,497 |
| Missouri City, TX | 75,348 | 142 | 1,049 | 1,191 |
| St. Joseph, MO | 75,369 | 729 | 3,851 | 4,579 |
| Union City, CA | 75,067 | 408 | 2,235 | 2,643 |