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( Mark One ) X ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from Securities registered pursuant to Section 12 ( b ) of the Act : Tennessee ( Mid - America Apartment Communities , Inc. ) Tennessee ( Mid - America Apartments , L.P. ) ( State or other jurisdiction of incorporation or organization ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 to Commission File Number 001-12762 ( Mid - America Apartment Communities , Inc. ) Commission File Number 333-190028-01 ( Mid - America Apartments , L.P. ) MID - AMERICA APARTMENT COMMUNITIES , INC . MID - AMERICA APARTMENTS , L.P. ( Exact name of registrant as specified in its charter ) Title of each class Common Stock , par value $ .01 per share ( Mid - America Apartment Communities , Inc. ) 8.50 % Series I Cumulative Redeemable Preferred Stock , $ .01 par value per share ( Mid - America Apartment Communities , Inc. ) Securities registered pursuant to Section 12 ( g ) of the Act : None . Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Mid - America Apartment Communities , Inc. Mid - America Apartments , L.P. Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Mid - America Apartment Communities , Inc. Mid - America Apartments , L.P. Mid - America Apartment Communities , Inc. Mid - America Apartments , L.P. Mid - America Apartment Communities , Inc. Large accelerated filer FORM 10 - K Mid - America Apartment Communities , Inc. Mid - America Apartments , L.P. Mid - America Apartments , L.P. 6815 Poplar Avenue , Suite 500 , Germantown , Tennessee , 38138 ( Address of principal executive offices ) ( Zip Code ) Registrant's telephone number , including area code : ( 901 ) 682-6600 Large accelerated filer be determined . Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Accelerated filer Accelerated filer Mid - America Apartment Communities , Inc. Mid - America Apartments , L.P. O Yes Yes Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Non - accelerated filer Yes □ Yes Non - accelerated filer > Yes > Yes > Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Mid - America Apartment Communities , Inc. Mid - America Apartments , L.P. Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Yes > Yes > ( I.R.S. Employer Identification No. ) Trading Symbol ( s ) MAA MAA * I 62-1543819 62-1543816 Name of each exchange on which registered New York Stock Exchange New York Stock Exchange No No | Smaller reporting company Yes Yes ☐ No | No | Smaller reporting company Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . O No No □ No No Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Emerging growth company No 区 No | The aggregate market value of the 79,152,084 shares of common stock of Mid - America Apartment Communities , Inc. held by non - affiliates was approximately $ 9.1 billion based on the closing price of $ 114.67 as reported on the New York Stock Exchange on June 30 , 2020. This calculation excludes shares of common stock held by the registrant's officers and directors and each person known by the registrant to beneficially own more than 5 % of the registrant's outstanding shares , as such persons may be deemed to be affiliates . This determination of affiliate status should not be deemed conclusive for any other purpose . As of February 15 , 2021 there were 114,389,362 shares of Mid - America Apartment Communities , Inc. common stock outstanding . There is no public trading market for the partnership units of Mid - America Apartments , L.P. As a result , an aggregate market value of the partnership units of Mid - America Apartments , L.P. cannot Documents Incorporated by Reference Portions of the proxy statement for the annual shareholders meeting of Mid - America Apartment Communities , Inc. to be held on May 18 , 2021 are incorporated by reference into Part III of this report . We expect to file our proxy statement within 120 days after December 31 , 2020 .