I hope you meant "enormous" as in "commendable" because it's a fantastic bargain compared to what they get for that money.
$151,360,905 of King County's property tax revenue in 2024 went to the library.[1]
From Wikipedia[2]:
"KCLS consists of 49 branches, one standalone book locker, the Traveling Library Center, ABC Express Vans, a mobile TechLab, and 11 bookmobiles."
"As of 2023, the library system serves a population of 1.6 million residents and has 3.7 million items in its collection . . ."
"Circulation 21.5 million"
And according to their 2025 budget, employs 842 people.[3]
I encourage you to review those statistics, and then look at the library system's website[4] for a sample of the events, access, and services they provide.
1: 2024 Property Tax Distribution for King County, Washington: https://cdn.kingcounty.gov/-/media/king-county/depts/assesso...
2: https://en.wikipedia.org/wiki/King_County_Library_System#
3:https://kcls.org/wp-content/uploads/sites/20/2024/12/2025-KC...
4: https://kcls.org/