    <SEC-DOCUMENT>0001104659-25-119335-index.html : 20251208
    <SEC-HEADER>0001104659-25-119335.hdr.sgml : 20251208
    <ACCEPTANCE-DATETIME>20251208164710
    ACCESSION NUMBER:		0001104659-25-119335
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		11
    CONFORMED PERIOD OF REPORT:	20250930
    FILED AS OF DATE:		20251208
    DATE AS OF CHANGE:		20251208
    EFFECTIVENESS DATE:		20251208

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			abrdn National Municipal Income Fund
    		CENTRAL INDEX KEY:			0000895574
    		ORGANIZATION NAME:
    		EIN:				411737161
    		STATE OF INCORPORATION:			MA
    		FISCAL YEAR END:			0330

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-07410
    		FILM NUMBER:		251556681

    	BUSINESS ADDRESS:
    		STREET 1:		C/O ABRDN
    		STREET 2:		1900 MARKET STREET, SUITE 200
    		CITY:			PHILADELPHIA
    		STATE:			PA
    		ZIP:			19103
    		BUSINESS PHONE:		215-405-5700

    	MAIL ADDRESS:
    		STREET 1:		C/O ABRDN
    		STREET 2:		1900 MARKET STREET, SUITE 200
    		CITY:			PHILADELPHIA
    		STATE:			PA
    		ZIP:			19103

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	Delaware Investments National Municipal Income Fund
    		DATE OF NAME CHANGE:	20081209

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	DELAWARE INVESTMENTS FLORIDA INSURED MUNICIPAL INCOME FUND
    		DATE OF NAME CHANGE:	20020327

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	VOYAGEUR FLORIDA INSURED MUNICIPAL INCOME FUND
    		DATE OF NAME CHANGE:	19930519
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>tm2527059d8_ncsr.htm
    <DESCRIPTION>N-CSR
    <TEXT>
    Document 1 - file: tm2527059d8_ncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CODEETH
    <SEQUENCE>2
    <FILENAME>tm2527059d8_ex99-codeeth.htm
    <DESCRIPTION>EXHIBIT 99.CODEETH
    <TEXT>
    Document 2 - file: tm2527059d8_ex99-codeeth.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>3
    <FILENAME>tm2527059d8_ex99-cert.htm
    <DESCRIPTION>EXHIBIT 99.CERT
    <TEXT>
    Document 3 - file: tm2527059d8_ex99-cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>4
    <FILENAME>tm2527059d8_ex99-906cert.htm
    <DESCRIPTION>EXHIBIT 99.906CERT
    <TEXT>
    Document 4 - file: tm2527059d8_ex99-906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(C)
    <SEQUENCE>5
    <FILENAME>tm2527059d8_ex99-xc.htm
    <DESCRIPTION>EXHIBIT 99.(C)
    <TEXT>
    Document 5 - file: tm2527059d8_ex99-xc.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(D)
    <SEQUENCE>6
    <FILENAME>tm2527059d8_ex99-xd.htm
    <DESCRIPTION>EXHIBIT 99.(D)
    <TEXT>
    Document 6 - file: tm2527059d8_ex99-xd.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>tm2527059d8vflreporti001.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: tm2527059d8vflreporti001.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>tm2527059d8vflreporti002.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: tm2527059d8vflreporti002.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>tm2527059d8vflreporti003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: tm2527059d8vflreporti003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>tm2527059d8vflreporti004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: tm2527059d8vflreporti004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>tm2527059d8vflreporti005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: tm2527059d8vflreporti005.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>