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☑ ☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K 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 to Commission File Number 000-30707 First Northern Community Bancorp California ( Exact name of Registrant as specified in its charter ) ( State or other jurisdiction of incorporation or organization ) 195 N First St. , Dixon , California ( Address of principal executive offices ) 68-0450397 ( I.R.S. Employer Identification Number ) 95620 ( Zip Code ) 707-678-3041 ( Registrant's telephone number including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class None Trading symbols ( s ) Not Applicable Name of each exchange on which registered Not Applicable Securities registered pursuant to Section 12 ( g ) of the Act : Common Stock , no par value Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes □ No ☑ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Exchange Act . No ☑ Yes □ 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 . Yes ☑ No □ Indicate by check mark whether the registrant has submitted electronically , if any , 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 ) . Yes ☑ No □ Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer or a smaller reporting company . See the definitions of “ large accelerated filer , ” “ accelerated filer ” and “ smaller reporting company ” in Rule 12b - 2 of the Exchange Act . Large accelerated filer ☐ Emerging growth company □ Accelerated filer ☐ Non - accelerated Filer Smaller reporting company ☑ ( Do not check if smaller reporting 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 . 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