    <SEC-DOCUMENT>0001564590-19-014240-index.html : 20190430
    <SEC-HEADER>0001564590-19-014240.hdr.sgml : 20190430
    <ACCEPTANCE-DATETIME>20190430155002
    ACCESSION NUMBER:		0001564590-19-014240
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		3
    CONFORMED PERIOD OF REPORT:	20190430
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20190430
    DATE AS OF CHANGE:		20190430

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			MARTIN MARIETTA MATERIALS INC
    		CENTRAL INDEX KEY:			0000916076
    		STANDARD INDUSTRIAL CLASSIFICATION:	MINING, QUARRYING OF NONMETALLIC MINERALS (NO FUELS) [1400]
    		IRS NUMBER:				561848578
    		STATE OF INCORPORATION:			NC
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-12744
    		FILM NUMBER:		19781404

    	BUSINESS ADDRESS:
    		STREET 1:		2710 WYCLIFF ROAD
    		CITY:			RALEIGH
    		STATE:			NC
    		ZIP:			27607
    		BUSINESS PHONE:		919-781-4550

    	MAIL ADDRESS:
    		STREET 1:		2710 WYCLIFF ROAD
    		CITY:			RALEIGH
    		STATE:			NC
    		ZIP:			27607
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>mlm-8k_20190430.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: mlm-8k_20190430.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>mlm-ex991_6.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: mlm-ex991_6.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>g0i1gv5sguae000001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: g0i1gv5sguae000001.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>