content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
    <headerData>
      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001714996</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000916076</issuerCik>
        <issuerName>MARTIN MARIETTA MATERIALS INC</issuerName>
        <secFileNumber>001-12744</secFileNumber>
        <issuerAddress>
          <com:street1>4123 PARKLAKE AVE</com:street1>
          <com:city>RALEIGH</com:city>
          <com:stateOrCountry>NC</com:stateOrCountry>
          <com:zipCode>27612</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>919-781-4550</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Mohr John P</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Former SVP, CIO</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Martin Marietta Materials, Inc.</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Commonwealth Financial Network</name>
          <address>
            <com:street1>29 Sawyer Road</com:street1>
            <com:city>Waltham</com:city>
            <com:stateOrCountry>MA</com:stateOrCountry>
            <com:zipCode>02453</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>3335</noOfUnitsSold>
        <aggregateMarketValue>1990194.60</aggregateMarketValue>
        <noOfUnitsOutstanding>61822465</noOfUnitsOutstanding>
        <approxSaleDate>03/19/2024</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/17/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting and Distribution of Restricted Stock Units</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Martin Marietta Materials, Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>131</amountOfSecuritiesAcquired>
        <paymentDate>02/17/2023</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>12/01/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Distribution of Stock Units Awarded Pursuant to the Martin Marietta Materials, Inc. Incentive Stock Plan</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Martin Marietta Materials, Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>244</amountOfSecuritiesAcquired>
        <paymentDate>12/01/2022</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/22/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting and Distribution of Restricted Stock Units</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Martin Marietta Materials, Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>372</amountOfSecuritiesAcquired>
        <paymentDate>02/22/2022</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/22/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting and Distribution of Performance Share Units</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Martin Marietta Materials, Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1108</amountOfSecuritiesAcquired>
        <paymentDate>02/22/2022</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/17/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting and Distribution of Restricted Stock Units</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Martin Marietta Materials, Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>144</amountOfSecuritiesAcquired>
        <paymentDate>02/17/2022</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>12/01/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Distribution of Stock Units Awarded Pursuant to the Martin Marietta Materials, Inc. Incentive Stock Plan</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Martin Marietta Materials, Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>262</amountOfSecuritiesAcquired>
        <paymentDate>12/01/2021</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/14/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting and Distribution of Performance Share Units</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Martin Marietta Materials, Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1074</amountOfSecuritiesAcquired>
        <paymentDate>02/14/2022</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>03/18/2024</noticeDate>
        <signature>Roselyn R. Bar, Attorney-in-Fact</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 6439}]
text: 144
  0001714996
  XXXXXXXX
  LIVE
  0000916076
  MARTIN MARIETTA MATERIALS INC
  001-12744
  4123 PARKLAKE AVE
  RALEIGH
  NC
  27612
  919-781-4550
  Mohr John P
  Former SVP, CIO
  Martin Marietta Materials, Inc.
  Commonwealth Financial Network
  29 Sawyer Road
  Waltham
  MA
  02453
  3335
  1990194.60
  61822465
  03/19/2024
  NYSE
  Common Stock
  02/17/2023
  Vesting and Distribution of Restricted Stock Units
  Martin Marietta Materials, Inc.
  N
  131
  02/17/2023
  Cash
  Common Stock
  12/01/2022
  Distribution of Stock Units Awarded Pursuant to the Martin Marietta Materials, Inc. Incentive Stock Plan
  Martin Marietta Materials, Inc.
  N
  244
  12/01/2022
  Cash
  Common Stock
  02/22/2022
  Vesting and Distribution of Restricted Stock Units
  Martin Marietta Materials, Inc.
  N
  372
  02/22/2022
  Cash
  Common Stock
  02/22/2022
  Vesting and Distribution of Performance Share Units
  Martin Marietta Materials, Inc.
  N
  1108
  02/22/2022
  Cash
  Common Stock
  02/17/2022
  Vesting and Distribution of Restricted Stock Units
  Martin Marietta Materials, Inc.
  N
  144
  02/17/2022
  Cash
  Common Stock
  12/01/2021
  Distribution of Stock Units Awarded Pursuant to the Martin Marietta Materials, Inc. Incentive Stock Plan
  Martin Marietta Materials, Inc.
  N
  262
  12/01/2021
  Cash
  Common Stock
  02/14/2022
  Vesting and Distribution of Performance Share Units
  Martin Marietta Materials, Inc.
  N
  1074
  02/14/2022
  Cash
  Y
  03/18/2024
  Roselyn R. Bar, Attorney-in-Fact