December 14, 2005


Ms. Janice K. Henry
Chief Financial Officer
Martin Marietta Materials, Inc.
2710 Wycliff Road
Raleigh, North Carolina  27607-3033





	Re:	Martin Marietta Materials, Inc.
		Form 10-K for Fiscal Year Ended December 31, 2004
Filed February 25, 2005
Forms 10-Q for Fiscal Quarters Ended March 31, June 30, and
September
30, 2005
      Filed May 4, August 3, and November 1, 2005
		File No. 1-12744




Dear Ms. Henry:

      We have reviewed your filing and have the following
comments.
We have limited our review of your filing to those issues we have
addressed in our comments.  Where indicated, we think you should
revise your document in response to these comments.  If you
disagree,
we will consider your explanation as to why our comment is
inapplicable or a revision is unnecessary.  Please be as detailed
as
necessary in your explanation.  In some of our comments, we may
ask
you to provide us with information so we may better understand
your
disclosure.  After reviewing this information, we may raise
additional comments.

	Please understand that the purpose of our review process is
to
assist you in your compliance with the applicable disclosure
requirements and to enhance the overall disclosure in your filing.
We look forward to working with you in these respects.  We welcome
any questions you may have about our comments or any other aspect
of
our review.  Feel free to call us at the telephone numbers listed
at
the end of this letter.


Form 10-K for the Fiscal Year Ended December 31, 2004

Exhibits 31.01 and 31.02

1. We note that the wording of your certifications pursuant to
Section 302 do not conform to the strict requirements as specified
in
Regulation S-K Item 601(b)(31) and Financial Release 33-8238.
Such
certifications must be worded exactly as indicated by the
Regulations.  Specifically, please eliminate the titles of the
certifying officers from the first line and remove the words
"annual
report" from paragraph #1.  Please provide a correctly worded,
separate certification for each person required to sign such
certifications in an amended filing.

Management`s Discussion and Analysis of Financial Condition and
Results of Operations

Results of Operations, page 37

2. The line items "net sales" and "cost of sales" in the table
provided exclude freight charges as disclosed in your Consolidated
Statements of Earnings.  Revise this table to include freight
costs
as disclosed in your Consolidated Statements of Earnings and
revise
your discussion of such items accordingly.

Net Sales, page 37

3. We note the discussion of "Heritage Aggregate Operations."
Tell
us what the Heritage Aggregate Operations represent and how it
relates to your financial statements and your discussion and
analysis
of the results of operations.  We may have further comment.

Grow Profit, page 38

4. The discussion here, and also again on page 39 in the "Analysis
of
Margins" section, refers to the term "gross margin."  It appears
to
us that your definition of "gross margin" excludes freight charges
from both the numerator and the denominator.  As such, it
represents
a non-GAAP measure.  The use of non-GAAP financial measures in a
filing must meet the requirements of Item 10(e) of Regulation S-K.
Amend this disclosure here and throughout your document to either
provide a discussion of the GAAP measure "gross profit" as it
appears
on your Consolidated Statements of Earnings, or to provide the
additional disclosures required for the use of a non-GAAP
financial
measure.  If you choose to use a non-GAAP measure, rename it so
that
it will not be confused with the terms "gross profit" and "gross
margin," which are used interchangeably to represent a GAAP term.

Capital Structure and Resources, page 62

5. We note the presentation of the non-GAAP financial measures
"adjusted debt," "total capital," and "debt to capital
capitalization, net of available cash."  Amend this discussion to
provide the additional disclosures required by Item 10(e) of
Regulation S-K for the use of these non-GAAP financial measures in
your filing

6. You disclose that the availability of financing resources,
including your revolving credit agreement, is expected to continue
to
be sufficient.  In footnote G of your financial statements, you
disclose that your revolving credit agreement contains restrictive
covenants relating to your debt to equity ratio.  We also note the
significant amount of goodwill and your critical accounting policy
in
that regard.  Tell us under what circumstances, if any, the
impairment of your goodwill would negatively affect your ability
to
borrow under your revolving credit agreement, and if so, whether
these circumstances would materially decrease your liquidity.  We
may
have further comment.


Financial Statements

Note M -Shareholders` Equity, page 30

7. Expand your disclosures to discuss in summary form the
pertinent
rights and privileges of the Corporation`s Shareholders` Rights
Plan,
as required by Statement of Financial Accounting Standard (SFAS)
Number 129, paragraph 4.


Form 10-Q for the Fiscal Quarters Ended March 31, June 30 and
September 30, 2005

Consolidated Statements of Earnings, page 4

8. We note the fluctuation of your interim effective tax rates in
each of your quarters ending in fiscal 2005 and in relation to the
effective rate reported in your prior three fiscal years.  Provide
a
discussion of the reasons for these fluctuations as part of your
Management Discussion and Analysis of results of operations.  Tell
us
how you have applied the provisions of Accounting Principles Board
Opinion No. 28, paragraph 19, in determining your interim
effective
tax rate.





Note 9 - Stock-Based Compensation, page 10

9. The disclosures regarding the pro forma effects of applying the
fair value method should be presented in a footnote preceding the
notes to financial statements or as the initial note.  See SFAS
No.
148, paragraph 2(e) which modifies paragraph 45 of SFAS No. 123.
Amend your filings to present this disclosure as required by this
standard.

Closing Comments

      As appropriate, please amend your filing and respond to
these
comments within 10 business days or tell us when you will provide
us
with a response.  You may wish to provide us with marked copies of
the amendment to expedite our review.  Please furnish a cover
letter
with your amendment that keys your responses to our comments and
provides any requested information.  Detailed cover letters
greatly
facilitate our review.  Please understand that we may have
additional
comments after reviewing your amendment and responses to our
comments.

	We urge all persons who are responsible for the accuracy and
adequacy of the disclosure in the filing to be certain that the
filing includes all information required under the Securities
Exchange Act of 1934 and that they have provided all information
investors require for an informed investment decision.  Since the
company and its management are in possession of all facts relating
to
a company`s disclosure, they are responsible for the accuracy and
adequacy of the disclosures they have made.

	In connection with responding to our comments, please
provide,
in writing, a statement from the company acknowledging that:

* the company is responsible for the adequacy and accuracy of the
disclosure in the filing;

* staff comments or changes to disclosure in response to staff
comments do not foreclose the Commission from taking any action
with
respect to the filing; and

* the company may not assert staff comments as a defense in any
proceeding initiated by the Commission or any person under the
federal securities laws of the United States.

      In addition, please be advised that the Division of
Enforcement
has access to all information you provide to the staff of the
Division of Corporation Finance in our review of your filing or in
response to our comments on your filing.

	You may contact Gary Newberry at (202) 551-3761, or Sandra
Eisen
at (202) 551-3864, if you have questions regarding comments on the
financial statements and related matters.  Please contact me at
(202)
551- 3684 with any other questions.

								Sincerely,



								April Sifford
								Branch Chief

??

??

??

??

Ms. Janice K. Henry
Martin Marietta Materials, Inc.
December 14, 2005
page 1



UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
100 F Street, N.E.
WASHINGTON, D.C. 20549-7010

   DIVISION OF
CORPORATION FINANCE
MAIL STOP 7010