San Mateo County librarian salary, 2025

46 people worked as librarians for San Mateo County in 2025. Those who worked the full year earned an average of $103,589.

What is the average librarian salary at San Mateo County?

Official pay range1

$85,488 to $124,717

from the lowest entry salary to the top of the highest librarian title

Average total pay, full-year librarians1

$103,589

average base pay $102,052

Based on the 29 of 46 librarians who worked the full year.

The largest group of San Mateo County's librarians (21 of 46) hold the title Librarian I, with an official range of $85,488 to $106,912. Those who worked the full year earned an average of $92,192, within the range.

Median total pay
$102,567
the middle librarian: half earned more, half less
Overtime
$0
average per full-year librarian
Starting salary
$85,488
bottom of the Librarian I range
Average pay rank
73rd
of 134 California employers

What does each librarian title at San Mateo County pay?

Each bar is the official range for one title, lowest first. The dot marks the average total pay of full-year staff in that title, where at least 5 people stand behind it.1

  1. Librarian I$85,488 to $106,912 · 21 people
    $92,192
  2. Librarian II$93,267 to $116,522 · 17 people
    $106,989
  3. Senior Librarian$99,757 to $124,717 · 8 people
    $111,310

official range average total pay, full year. "Fewer than 5" means too few full-year people in that title to show.

Library assistant pay at San Mateo County

Counted on their own, kept out of the librarian figures on this page. Each group's name leads to its statewide overview. Range: the middle reported bottom and top of each group's official ranges. Pay: average total pay of full-year staff, overtime included.1

Library staffPeopleOfficial rangeAverage total pay
Librarians46$85,488 to $124,717$103,589
Library assistants112$65,499 to $73,195$76,821

Full-year library assistants averaged $76,821, $26,768 less than librarians.

Does San Mateo County pay librarians more than other employers in San Mateo County?

Average total pay of full-year librarians: San Mateo County next to every employer in the county together, and the whole state.1

Full-year librarians at San Mateo County earned $2,883 less than the San Mateo County average and $4,443 less than the California average.

Average librarian pay in San Mateo County compared to nearby counties

Average total pay of full-year librarians across all employers in each county that borders San Mateo County, and how much more or less it pays.1

San Mateo County Shades match the state map.

Where does San Mateo County rank among California employers?

Every employer with at least 5 full-year librarians, by average total pay.1

All 134 California employers

San Mateo County ranks 73rd of 134, below the middle employer.

San Mateo County
$100k$150k$200k

Middle employer: $104,744

The 6 employers in San Mateo County

San Mateo County ranks 4th of 6, below the middle employer.

San Mateo County
$100k$120k

Middle employer: $107,120

Each bar counts the employers whose average total pay falls in a $5,000 band. The dashed line marks the middle employer.

Pension and health cover at San Mateo County

As reported by the county. Contributions are what the employer paid per full-year librarian, on top of wages.1

Pension formula
2% at 62
the most common formula among San Mateo County's librarians
Employer pension contribution
$23,528
average per year
Health, dental and vision
$13,759
average paid by the employer per year

Questions about librarian pay at San Mateo County

What is the average librarian salary at San Mateo County?

Librarians at San Mateo County who worked the full year earned an average of $103,589 in 2025. The middle librarian earned $102,567: half earned more, half less. The official pay range across its librarian titles runs from $85,488 to $124,717.

How much overtime do librarians at San Mateo County earn?

Full-year librarians were paid an average of $0 in overtime in 2025. The middle one was paid $0: a few people with a lot of overtime pull the average up.

What is the starting salary for a librarian at San Mateo County?

$85,488 a year: the bottom of the official range for San Mateo County's Librarian I title in 2025, as reported. Pay rises with steps and overtime; full-year librarians averaged $103,589 in total pay.

How much does a library assistant make at San Mateo County?

Full-year library assistants at San Mateo County averaged $76,821 in total pay in 2025, overtime included, on an official range of $65,499 to $73,195.

What pension do librarians at San Mateo County get?

The most common pension formula among San Mateo County's librarians is 2% at 62, as reported by the county. The employer paid an average of $23,528 a year into the pension plan.

More salaries in San Mateo County

Sources for the San Mateo County figures

Every person who held a librarian position at San Mateo County at any point in 2025 counts toward the headcount. Pay figures use only people who worked roughly the full year: those whose regular pay reached at least 90% of the bottom of their official range. Total pay is gross wages before tax, including overtime, lump sums and other pay. Averages lead; the median total pay is the middle person's, with half above and half below, and is less pulled by a few people with very high pay. Every figure covers at least 5 people.

  1. State Controller's Office, Government Compensation in California, 2025: positions, official pay ranges, wages, pension formula and employer contributions as reported by San Mateo County.

How we read the data