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<ACCEPTANCE-DATETIME>20200108130602
ACCESSION NUMBER:		0001193125-20-003642
CONFORMED SUBMISSION TYPE:	485BPOS
PUBLIC DOCUMENT COUNT:		25
FILED AS OF DATE:		20200108
DATE AS OF CHANGE:		20200108
EFFECTIVENESS DATE:		20200108

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SIT U S GOVERNMENT SECURITIES FUND INC
		CENTRAL INDEX KEY:			0000809981
		IRS NUMBER:				411570831
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			0331

	FILING VALUES:
		FORM TYPE:		485BPOS
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	033-11549
		FILM NUMBER:		20515165

	BUSINESS ADDRESS:	
		STREET 1:		3300 IDS CTR 80 S 8TH ST
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55402
		BUSINESS PHONE:		6123323223

	MAIL ADDRESS:	
		STREET 1:		3300 IDS CENTER, 80 SOUTH EIGHTH  ST
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55402-4130

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SIT NEW BEGINNING U S GOVERNMENT SECURITIES FUND INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NEW BEGINNING U S GOVERNMENT SECURITIES FUND INC
		DATE OF NAME CHANGE:	19870601

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SIT U S GOVERNMENT SECURITIES FUND INC
		CENTRAL INDEX KEY:			0000809981
		IRS NUMBER:				411570831
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			0331

	FILING VALUES:
		FORM TYPE:		485BPOS
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-04995
		FILM NUMBER:		20515164

	BUSINESS ADDRESS:	
		STREET 1:		3300 IDS CTR 80 S 8TH ST
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55402
		BUSINESS PHONE:		6123323223

	MAIL ADDRESS:	
		STREET 1:		3300 IDS CENTER, 80 SOUTH EIGHTH  ST
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55402-4130

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SIT NEW BEGINNING U S GOVERNMENT SECURITIES FUND INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NEW BEGINNING U S GOVERNMENT SECURITIES FUND INC
		DATE OF NAME CHANGE:	19870601

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SIT MUTUAL FUNDS II INC
		CENTRAL INDEX KEY:			0000746601
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			0331

	FILING VALUES:
		FORM TYPE:		485BPOS
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	002-91312
		FILM NUMBER:		20515163

	BUSINESS ADDRESS:	
		STREET 1:		3300 IDS CTR, 80 S. 8TH STREET
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55402
		BUSINESS PHONE:		612-332-3223

	MAIL ADDRESS:	
		STREET 1:		3300 IDS CTR, 80 S. 8TH STREET
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55402

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SIT NEW BEGINNING TAX FREE INCOME FUND INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SIT NEW BEGINNING YIELD FUND INC
		DATE OF NAME CHANGE:	19880929

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NEW BEGINNING YIELD FUND INC
		DATE OF NAME CHANGE:	19870907

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SIT MUTUAL FUNDS II INC
		CENTRAL INDEX KEY:			0000746601
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			0331

	FILING VALUES:
		FORM TYPE:		485BPOS
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-04033
		FILM NUMBER:		20515162

	BUSINESS ADDRESS:	
		STREET 1:		3300 IDS CTR, 80 S. 8TH STREET
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55402
		BUSINESS PHONE:		612-332-3223

	MAIL ADDRESS:	
		STREET 1:		3300 IDS CTR, 80 S. 8TH STREET
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55402

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SIT NEW BEGINNING TAX FREE INCOME FUND INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SIT NEW BEGINNING YIELD FUND INC
		DATE OF NAME CHANGE:	19880929

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NEW BEGINNING YIELD FUND INC
		DATE OF NAME CHANGE:	19870907
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<SERIES>
<OWNER-CIK>0000746601
<SERIES-ID>S000003467
<SERIES-NAME>Sit Tax-Free Income Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000009601
<CLASS-CONTRACT-NAME>Sit Tax-Free Income Fund
<CLASS-CONTRACT-TICKER-SYMBOL>SNTIX
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<SERIES>
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<DOCUMENT>
<TYPE>485BPOS
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<FILENAME>d854564d485bpos.htm
<DESCRIPTION>SIT U.S. GOVERNMENT SECURITIES FUND AND SIT MUTUAL FUNDS II, INC.
<TEXT>
Document 1 - file: d854564d485bpos.htm

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<TYPE>EX-101.INS
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<FILENAME>susgfi-20191220.xml
<DESCRIPTION>XBRL INSTANCE DOCUMENT
<TEXT>
Document 2 - file: susgfi-20191220.xml

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<DOCUMENT>
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<SEQUENCE>3
<FILENAME>susgfi-20191220.xsd
<DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
<TEXT>
Document 3 - file: susgfi-20191220.xsd

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<FILENAME>susgfi-20191220_cal.xml
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<TEXT>
Document 4 - file: susgfi-20191220_cal.xml

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<TYPE>EX-101.DEF
<SEQUENCE>5
<FILENAME>susgfi-20191220_def.xml
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<TEXT>
Document 5 - file: susgfi-20191220_def.xml

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<TYPE>EX-101.LAB
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<FILENAME>susgfi-20191220_lab.xml
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<TEXT>
Document 6 - file: susgfi-20191220_lab.xml

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<TYPE>EX-101.PRE
<SEQUENCE>7
<FILENAME>susgfi-20191220_pre.xml
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<TEXT>
Document 7 - file: susgfi-20191220_pre.xml

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<FILENAME>BarChart1.png
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<TEXT>
Document 9 - file: BarChart1.png

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Document 11 - file: FilingSummary.html

Document 11 - RAW XML: FilingSummary.xml

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Document 12 - file: R30.htm

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<TEXT>
Document 13 - file: R2.htm

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<SEQUENCE>14
<FILENAME>report.css
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<TEXT>
Document 14 - file: report.css

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<TEXT>
Document 15 - file: BarChart4.png

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<TEXT>
Document 16 - file: R29.htm

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<DOCUMENT>
<TYPE>ZIP
<SEQUENCE>17
<FILENAME>0001193125-20-003642-xbrl.zip
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<TEXT>
Document 17 - file: 0001193125-20-003642-xbrl.zip

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<FILENAME>R8.htm
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<TEXT>
Document 18 - file: R8.htm

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<TYPE>XML
<SEQUENCE>19
<FILENAME>R15.htm
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<TEXT>
Document 19 - file: R15.htm

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<SEQUENCE>20
<FILENAME>Show.js
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<TEXT>
Document 20 - file: Show.js

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Document 22 - file: R23.htm

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