Where have all the children gone in San Francisco? They're probably at the public library

San Francisco Public Library

In addition to the Main Library, San Francisco Public Library operates 27 branches, all of which offer programs for children and families.

Related reading
San Francisco asks:  Where Have All the Children Gone?  (The New York Times, 1/21/2017)

As an urban renaissance has swept through major American cities in recent decades, San Francisco’s population has risen to historical highs and a forest of skyscraping condominiums has replaced tumbledown warehouses and abandoned wharves. At the same time, the share of children in San Francisco fell to 13 percent, low even compared with another expensive city, New York, with 21 percent. In Chicago, 23 percent of the population is under 18 years old, which is also the overall average across the United States.

Source:  Wikipedia

Two things to add before closing:

1. 13% of 864,816 = 112,426
2. I don't have access to SFPL program attendance.