Source: Board of Governors of the Federal Reserve System (US)
Release: Banking and Monetary Statistics, 1914-1941
This series may have irregularities or important features that are not disclosed here. To see whether this is the case, please consult Part 1, Section 1, Table 8 in the original source at https://fraser.stlouisfed.org/scribd/?item_id=6408&filepath=%2Fdocs%2Fpublications%2Fbms%2F1914-1941%2FBMS14-41_complete.pdf&start_page=1
Relevant details can be found in the footnotes of each table as well as the introductory material for Section 1.
Board of Governors of the Federal Reserve System (US), Number of Banks in the United States [X08ABUS], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/X08ABUS, March 27, 2023.