    <SEC-DOCUMENT>0001174947-25-000523-index.html : 20250404
    <SEC-HEADER>0001174947-25-000523.hdr.sgml : 20250404
    <ACCEPTANCE-DATETIME>20250404161759
    ACCESSION NUMBER:		0001174947-25-000523
    CONFORMED SUBMISSION TYPE:	ARS
    PUBLIC DOCUMENT COUNT:		1
    CONFORMED PERIOD OF REPORT:	20241231
    FILED AS OF DATE:		20250404
    DATE AS OF CHANGE:		20250404
    EFFECTIVENESS DATE:		20250404

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			MIDDLEFIELD BANC CORP
    		CENTRAL INDEX KEY:			0000836147
    		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
    		ORGANIZATION NAME:           	02 Finance
    		EIN:				341585111
    		STATE OF INCORPORATION:			OH
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		ARS
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-36613
    		FILM NUMBER:		25814997

    	BUSINESS ADDRESS:
    		STREET 1:		15985 EAST HIGH STREET
    		STREET 2:		P O BOX 35
    		CITY:			MIDDLEFIELD
    		STATE:			OH
    		ZIP:			44062-9263
    		BUSINESS PHONE:		4406321666

    	MAIL ADDRESS:
    		STREET 1:		15985 EAST HIGH STREET
    		STREET 2:		P O BOX 35
    		CITY:			MIDDLEFIELD
    		STATE:			OH
    		ZIP:			44062-9263
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>ARS
    <SEQUENCE>1
    <FILENAME>ars-73336_mbcn.pdf
    <DESCRIPTION>ARS
    <TEXT>
    Document 1 - file: ars-73336_mbcn.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>