What does WatchPennies calculate?

WatchPennies estimates cost of living by US county across housing, food, transportation, healthcare, childcare, other necessities, taxes, and income context.

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Can I compare two counties on WatchPennies?

Yes. WatchPennies lets you compare counties and adjust salary and family type to estimate relative cost differences.

What does the San Mateo County, CA vs San Joaquin County, CA comparison show?

It compares estimated living costs by category, including housing, food, transportation, healthcare, childcare, other necessities, taxes, and income context.

Can I change the salary and family type?

Yes. The comparison calculator supports salary and family type inputs so you can model costs for different households.

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San Mateo County, CA vs San Joaquin County, CA: Cost of Living Difference

Is it cheaper?

San Joaquin County, CA is cheaper than San Mateo County, CA.

Moving to San Joaquin County, CA is estimated to save $38,064 per year.

Cheaper County

San Joaquin County, CASave about $38,064 per year.

Salary needed

$50,000 in San Mateo County, CA is about $29,690 in San Joaquin County, CA.

Biggest drivers

No measured category is higher in San Joaquin County, CA. Housing saves $15,405 per year.

Housing: $15,405 lower in San Joaquin County, CA

Taxes: $14,419 lower in San Joaquin County, CA

Childcare: about the same in both counties

Healthcare: $1,230 lower in San Joaquin County, CA

Food: $1,004 lower in San Joaquin County, CA

Transport: $912 lower in San Joaquin County, CA

San Mateo County, CA→San Joaquin County, CA

Equivalent salary in San Joaquin County, CA

$29,690

-40.62% lower

Current salary: $50,000

Household: 1 adult · 0 children

Median Income in San Mateo County, CA: $184,583

Median Income in San Joaquin County, CA: $98,914

Living Index in San Mateo County, CA 50.77%

Living Index in San Joaquin County, CA 56.27%

This estimate matches your purchasing power (equivalent salary) when moving from San Mateo County, CA to San Joaquin County, CA.

* Living index is estimated as (estimated total cost / area median income) * 100. A living index above 100% means modeled costs exceed median income.

Cost of Living Breakdown by Category

Summary

Moving from San Mateo County, CA to San Joaquin County, CA is estimated to save $38,064 per year. A $50,000 salary in San Mateo County, CA would have similar purchasing power to about $29,690 in San Joaquin County, CA. The largest savings come from housing and taxes.

This is a 40.62% decrease in modeled annual costs. Housing is $15,405 per year lower (50.71%); Taxes is $14,419 per year lower (57.55%).

Below we break down the annual categories behind the difference using Economic Policy Institute 2026 Family Budget data.

What changed the most?

The following cards show the annual category differences that most affect the move to San Joaquin County, CA.

Biggest Cost

Largest annual cost increase when moving to San Joaquin County, CA

Annual Increase:

No increase

No measured category is higher in San Joaquin County, CA.

Biggest Savings

Largest annual savings when moving to San Joaquin County, CA

Annual Savings:

$15,405 per year

HOUSING has the largest annual savings when moving to San Joaquin County, CA.

Breakdown of price percentages per category.

Numbers are average costs per section.

Category	Difference
Housing	-50.71% lower
San Mateo County, CA San Joaquin County, CA Average Cost $30381.00 $14976.00 INFO: Housing costs are based on Department of Housing and Urban Development data. The estimate uses 40th percentile rent for privately owned rental units in each area. Studio apartments are paired with one-adult households, one-bedroom apartments with two-adult households, and two-bedroom apartments with households that have children.
Food	-18.75% lower
San Mateo County, CA San Joaquin County, CA Average Cost $5354.00 $4350.00 INFO: Food costs are based on the U.S. Department of Agriculture's food plans. Numbers are normalized to each area using Feeding America and Meal Gap data. This estimate assumes most food is bought at local grocery stores and prepared at home.
Transport	-6.38% lower
San Mateo County, CA San Joaquin County, CA Average Cost $14301.00 $13389.00 INFO: Transportation costs are a combination of auto ownership, auto use, and public transit. Data is collected from the Center for Neighborhood Technology (CNT).
Healthcare	-16.32% lower
San Mateo County, CA San Joaquin County, CA Average Cost $7535.00 $6305.00 INFO: Healthcare expenses come from average insurance premiums and out-of-pocket costs. The estimate assumes families purchase the lowest-cost available insurance plan under the Affordable Care Act. Data comes from Kaiser Family Foundation and the U.S. Department of Health and Human Services (HHS).
Other Costs	-45.92% lower
San Mateo County, CA San Joaquin County, CA Average Cost $11095.00 $6000.00 INFO: This cost is calculated through the average spending of categories deemed necessary by the Bureau of Labor Statistics Consumer Expenditure Survey. These include apparel, personal care, household supplies, reading materials, and school supplies.
Childcare	0.00% higher
San Mateo County, CA San Joaquin County, CA Average Cost $0.00 $0.00 INFO: Childcare expenses are based on combined costs for center-based care and family-based care for 4-year-olds and school-aged children. For households with one child, the estimate assumes the child is 4 years old. For households with two children, the estimate assumes the second child is 8 years old.
Taxes	-57.55% lower
San Mateo County, CA San Joaquin County, CA Average Cost $25053.00 $10634.00 INFO: Taxes are calculated from the National Bureau of Economic Research. The number weighs in personal income tax, state income tax, federal Social Security, and Medicare taxes.

In San Joaquin County, CA, modeled annual costs are $55,654 compared with $93,718 in San Mateo County, CA.

Overall, annual costs are lower in San Joaquin County, CA. The category breakdown above shows where the move creates the most room in the budget.

In this case San Joaquin County, CA and San Mateo County, CA are both metropolitan locations.

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