The FRED series Debt Outstanding Domestic Nonfinancial Sectors - State and Local Governments Sector is now known as State and Local Governments, Excluding Employee Retirement Funds; Credit Market Instruments; Liability.
The source series id is LA214104005.Q.
This series appears in Table D.3. For further information see the assistance provided in the guide to the Financial Accounts at http://www.federalreserve.gov/apps/fof/.
As stated on the December 08, 2011 release:
The instrument tables on municipal securities and loans (tables F.211 and L.211) have been revised from 2004:Q1 forward to reflect a change in data sources. Data on debt outstanding and net issuance for state and local governments, nonprofit organizations, and nonfinancial corporate business
(industrial revenue bonds) are now based on data from Mergent, a private data vendor. The new data indicate that municipal securities and loans
outstanding in 2004:Q1 is $740 billion greater than previously estimated in the flow of funds accounts.
The estimate of household holdings of municipal securities and loans is revised up by about $840 billion, on average, from 2004 forward.
Board of Governors of the Federal Reserve System (US), State and Local Governments, Excluding Employee Retirement Funds; Credit Market Instruments; Liability, Level [SLGSDODNS], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/SLGSDODNS, June 19, 2018.