What Data Scientists earn in San Mateo County, CA
The median pay for Data Scientists in San Mateo County, CA is $170,110 per year, which works out to $81.78 per hour. The figure comes from the Bureau of Labor Statistics wage survey for the San Francisco-Oakland-Fremont, CA metropolitan area, the labor market that San Mateo County, CA belongs to. Half of the workers in this occupation earn more than the median and half earn less, which makes it a sturdier yardstick than an average that a few very high earners can pull upward.
The mean wage is $174,830, which is 2.8% above the median, so pay is spread fairly evenly. The survey counts about 10,460 people working in this occupation across the San Francisco-Oakland-Fremont, CA metropolitan area, so the estimate rests on a substantial pool of workers. San Mateo County, CA has roughly 742,340 residents, according to the population figures used by the rent data.
The salary range, from entry level to top earners
Pay for Data Scientists in the San Francisco-Oakland-Fremont, CA metropolitan area is not one number. The lowest-paid tenth of workers earn up to $99,170 a year ($47.68 an hour), while the highest-paid tenth earn $272,430 or more ($130.98 an hour). That is a gap of $173,260 between the bottom and the top of the scale. The middle half of workers falls between $130,430 at the 25th percentile and $212,970 at the 75th percentile. A top-tier earner makes 2.7 times what someone at the bottom makes, so experience, certification and employer all matter.
What the hourly rate looks like
Employers quote this occupation by the hour or by the year, so here are both: $81.78 an hour or $170,110 a year at the median for San Mateo County, CA. Before any deductions, that is $14,176 a month, $6,543 every two weeks and $3,271 each week. After taxes the same job pays $55.53 per hour of take-home income, which is the number that actually has to cover rent and groceries.
How pay in San Mateo County, CA compares
Compared with the California average
A worker in this occupation in San Mateo County, CA earns $22,092 more than the California average of $148,018, a premium of 14.9%. Over a year that premium is worth $22,092 before tax and roughly $15,000 after tax. Within California, San Mateo County, CA already has the highest median we track for this job.
Compared with the national average
The national employment-weighted average for Data Scientists is $121,644 across the contiguous United States. At $170,110, San Mateo County, CA pays $48,466 more, which is 39.8% above that benchmark. Keep in mind that a higher salary only helps if living costs do not rise faster, which is why the cost sections below matter as much as the headline number.
Where this job ranks in San Mateo County, CA
Among the 600 occupations with published wages in San Mateo County, CA, Data Scientists ranks number 45 by median pay, ahead of about 93% of them. The best-paying occupation we track here is Computer and Information Systems Managers at $232,890 a year, which is $62,780 more than the median for Data Scientists.
From gross pay to take-home pay
Three separate tax bills sit between the gross salary and the bank account: federal income tax, FICA, and state income tax. For Data Scientists earning the San Mateo County, CA median of $170,110, they add up to $54,605. The result is $115,505 of take-home pay a year ($9,625 a month), based on a single filer using the standard deduction.
Put another way, of every $100 earned, about $32 goes to taxes and $68 reaches the paycheck. The overall effective tax rate is 32.1%.
Federal income tax
After the $15,750 standard deduction, taxable income is $154,360. Federal brackets are marginal, so only the slice of income above each threshold is taxed at the higher rate; the last dollars of this salary fall in the 24% bracket. The resulting federal income tax is $29,893, an effective 17.6% of gross pay, well below the 24% marginal rate because the lower brackets are cheaper.
Social Security and Medicare (FICA)
Payroll taxes are a flat percentage of wages. Social Security takes 6.2% up to a wage base of $176,100, which costs $10,547 on this salary. Medicare takes 1.45%, or $2,467. FICA totals $13,013, which is 7.7% of gross pay.
State income tax in California
California income tax on this salary is $11,698 a year, or 6.9% of gross pay, after the state's own deductions and exemptions are applied. That is 39% of the federal income tax bill, and it comes out to $975 a month. Local taxes such as county or city income taxes are not included, so a few jurisdictions may withhold slightly more.
A cross-check with IRS data for San Mateo County, CA
IRS Statistics of Income data for San Mateo County, CA show an average adjusted gross income of $236,960 per return and an average effective federal income tax rate of 22.3% across all filers. Filers in the $100,000 to under $200,000 bracket, where this salary falls, paid an average of 13.0%, compared with the 17.6% estimated here for a single filer taking the standard deduction. Gaps between the two reflect filing status, dependents, credits and other income, none of which a single-person wage estimate includes.
Cost of living in San Mateo County, CA
Take-home pay only means something next to what life costs. We price four basics for one adult in San Mateo County, CA: a one-bedroom apartment, food, home energy and gasoline. All of them are converted to annual figures first, then compared with the $115,505 of take-home pay.
Rent
Housing is the largest line in most budgets. For San Mateo County, CA, HUD sets the Fair Market Rent for a one-bedroom unit at $3,003 a month ($36,036 a year), and at $3,697 for two bedrooms. For Data Scientists, a one-bedroom absorbs 31.2% of take-home pay and 21.2% of gross pay.
Food
The USDA Thrifty Food Plan (August 2026) puts the cost of a nutritious home-cooked diet for an adult at about $3,436 a year, which is $286 a month or $66.07 a week. That equals 2.0% of gross pay for Data Scientists in San Mateo County, CA. It is a thrifty budget with no restaurant meals, so treat it as a floor.
Energy and gasoline
Using California residential prices from the Energy Information Administration and national household averages for consumption, electricity costs about $3,378 a year and other home energy such as natural gas about $751, for $4,129 in total. Gasoline in California averages $4.42 per gallon; at about 463 gallons a year (11,106 miles at 24 miles per gallon) fuel adds $2,047.
What is left over
Rent, food, energy and gasoline cost $45,647 a year in San Mateo County, CA. Subtract that from $115,505 of take-home pay and $69,858 remains, which is $5,821 a month of breathing room. That margin equals 41.1% of gross pay, a comfortable cushion by common budgeting rules.
Can Data Scientists afford to live in San Mateo County, CA?
The 30% rent guideline
A common rule of thumb says rent should stay under 30% of gross income. For a gross salary of $170,110 that ceiling is $4,253 a month. The one-bedroom Fair Market Rent of $3,003 is $1,250 under it, so rent fits the guideline. Put as a wage, covering a one-bedroom at the 30% guideline takes $57.75 an hour; the median for Data Scientists is $81.78, which is 42% above that mark. Another way to see it: at $55.53 of take-home pay an hour, a one-bedroom takes about 12.5 working hours every week.
Splitting a two-bedroom
Sharing a two-bedroom at $3,697 a month means $1,849 each. Compared with renting a one-bedroom alone, that saves $13,854 a year. With a roommate, the yearly margin after the basics becomes $83,712.
How fast you can save
At $5,821 a month of margin, building a $10,000 emergency fund would take about 2 months. Setting aside half of the margin stretches the same goal to about 4 months. These figures ignore interest, raises and any spending beyond the four basics.
Frequently asked questions about Data Scientists pay in San Mateo County, CA
How much do Data Scientists make per hour in San Mateo County, CA?
The median is $81.78 per hour, based on $170,110 a year over 2,080 hours. Hourly pay runs from about $47.68 at the 10th percentile to $130.98 at the 90th percentile.
How much do Data Scientists take home after taxes in San Mateo County, CA?
After federal income tax, FICA and state income tax, the median salary of $170,110 becomes $115,505 a year. That is $9,625 a month, $4,442 every two weeks or $2,221 a week.
How much tax do Data Scientists pay in San Mateo County, CA?
Total taxes are $54,605 a year, an effective rate of 32.1%: $29,893 federal income tax, $13,013 FICA and $11,698 California income tax.
Do Data Scientists earn more in San Mateo County, CA than elsewhere in California?
Yes. The local median of $170,110 is +14.9% versus the California average of $148,018, a difference of $22,092 a year.
Can Data Scientists afford a one-bedroom apartment in San Mateo County, CA?
A one-bedroom costs $3,003 a month against take-home pay of $9,625, which is 31.2% of take-home pay. That meets the 30%-of-gross guideline, which allows up to $4,253 a month.
What is the monthly budget margin for Data Scientists in San Mateo County, CA?
About $5,821 a month ($69,858 a year) remains after a one-bedroom apartment, food, home energy and gasoline, which together cost $45,647 a year.
What hourly wage covers a one-bedroom in San Mateo County, CA at the 30% guideline?
$57.75 an hour for a full-time schedule, calculated as the $36,036 annual rent divided by 0.30 and by 2,080 hours. The median for Data Scientists is $81.78.
How we calculated these numbers
Wages are May 2025 medians from the Bureau of Labor Statistics Occupational Employment and Wage Statistics survey for the San Francisco-Oakland-Fremont, CA metropolitan area; hourly-only values are annualized at 2,080 hours. Rents are HUD Fair Market Rents, food costs come from the USDA Thrifty Food Plan, and energy prices come from the Energy Information Administration. County-level tax statistics come from the IRS Statistics of Income.
Taxes use tax-year 2025 federal brackets, FICA rates and the California rules for a single filer with wage income only. Figures are estimates for planning and comparison, not tax or financial advice, and they exclude local income taxes, benefits, retirement contributions and individual circumstances.