    <SEC-DOCUMENT>0001193125-24-081681-index.html : 20240329
    <SEC-HEADER>0001193125-24-081681.hdr.sgml : 20240329
    <ACCEPTANCE-DATETIME>20240329110310
    ACCESSION NUMBER:		0001193125-24-081681
    CONFORMED SUBMISSION TYPE:	ARS
    PUBLIC DOCUMENT COUNT:		1
    CONFORMED PERIOD OF REPORT:	20231231
    FILED AS OF DATE:		20240329
    DATE AS OF CHANGE:		20240329
    EFFECTIVENESS DATE:		20240329

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			UNITIL CORP
    		CENTRAL INDEX KEY:			0000755001
    		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC & OTHER SERVICES COMBINED [4931]
    		ORGANIZATION NAME:           	01 Energy & Transportation
    		IRS NUMBER:				020381573
    		STATE OF INCORPORATION:			NH
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		ARS
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-08858
    		FILM NUMBER:		24802587

    	BUSINESS ADDRESS:
    		STREET 1:		6 LIBERTY LANE WEST
    		CITY:			HAMPTON
    		STATE:			NH
    		ZIP:			03842
    		BUSINESS PHONE:		6037736504

    	MAIL ADDRESS:
    		STREET 1:		6 LIBERTY LANE WEST
    		CITY:			HAMPTON
    		STATE:			NH
    		ZIP:			03842
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>ARS
    <SEQUENCE>1
    <FILENAME>d846632dars.pdf
    <DESCRIPTION>ARS
    <TEXT>
    Document 1 - file: d846632dars.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>