San Mateo at a glance
- Population: roughly 101,327 people; 72nd of 482 places in California (Census Vintage 2023 subcounty estimate).
- 2020 Census base: 105,665 residents at the 2020 Census (US Census Bureau, 2020 count).
- 2020 to 2023 change: down about 4.1% from the 2020 Census base to the 2023 estimate (US Census Bureau).
- Rank among California places: the 72nd-largest of 482 (US Census Bureau, 2023 estimate).
- Size percentile: about 85% of places in California are smaller (US Census Bureau).
- Coordinates: it sits at 37.5603, -122.3106 in the US Census Bureau Gazetteer.
- Nearest larger cities (within 120 miles): Hayward, CA (12 mi); Oakland, CA (15 mi); Sunnyvale, CA (20 mi); Fremont, CA (21 mi); Berkeley, CA (21 mi) (US Census Bureau populations).
- Smaller towns nearby: Hillsborough, CA (3 mi); Foster City, CA (3 mi); Belmont, CA (3 mi) (US Census Bureau).
What a personal loan costs in San Mateo
Personal loans are closed-end installment debt, so the monthly payment and the payoff date are known from the start.
APR, not the simple interest rate, reflects what the loan actually costs once fees are included; the personal loan calculator puts a figure on it.
A lender weighs your credit profile, income and debts when setting the rate, and a longer term lowers the payment at the cost of more interest overall.
Before you borrow, decide what the loan is for and whether the monthly payment fits a budget you can already meet without taking on new debt.
California lending rules that apply in San Mateo
Every figure in the table below is sourced to a publisher with a date; where a state does not publish a number, we say so rather than estimate.
| Rule | Detail | Source |
|---|---|---|
| Payday lending status | Permitted under the California Deferred Deposit Transaction Law; max $300 face amount; fee ≤15%; term up to 31 days Source says: "The face amount of the check shall not exceed three hundred dollars ($300)"; "A fee for a deferred deposit transaction shall not exceed 15 percent of the face amount of the check" (Financial Code § 23036). | California Legislature — Financial Code § 23035 (and § 23036) as of 2026-09-16 |
| Small-loan / installment lender licensing | Finance lender/broker license required from the Commissioner of Financial Protection and Innovation (California Financing Law) Source says: "No person shall engage in the business of a finance lender or broker without obtaining a license from the commissioner". | California Legislature — Financial Code § 22100 as of 2026-09-16 |
| State lending regulator | California Department of Financial Protection and Innovation (DFPI) Source says: "“Department” means the Department of Financial Protection and Innovation". | California Legislature — Financial Code § 23001 as of 2026-09-16 |
| 36% rate cap on mid-size consumer loans (AB 539) | Consumer loans of $2,500 to under $10,000: cap of 36% per annum simple interest plus the Federal Funds Rate Source says: "charges at a rate not exceeding an annual simple interest rate of 36 percent per annum plus the Federal Funds Rate". | California Legislature — Financial Code § 22304.5 as of 2026-09-16 |
| Maximum legal interest rate (usury cap) | 7% per annum default; written contracts may set up to 10% per annum for consumer-purpose loans Source says: "shall be 7 percent per annum"; "for use primarily for personal, family, or household purposes, at a rate not exceeding 10 percent per annum". | California Legislature — California Constitution, Article XV, § 1 as of 2026-09-16 |
How to compare offers in San Mateo
Run through this list before signing anything in San Mateo:
- Pull your free credit reports and dispute any error — it is the cheapest way to improve the rate you are offered.
- Run your figures through the personal loan calculator on this site so you know the payment before a lender quotes one.
- Pre-qualify with at least three lenders and compare the APR, not the interest rate.
- Check that the lender is licensed in California using the regulator named above.
- Read the disclosure for origination fees and any prepayment penalty before you sign.