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August 30, 1794 New Garden Meeting Minutes, "William Browns Request which was Received from Last Meeting Coming Under Notice At this time But he being deceased his Widdow and Children were Received Whose Sons Names James & Elias And Daughters Names Anna & Rebeckah" 
In 1820, it is believed Elias Brown was recorded in the Federal Census for Salisbury, Guilford County, North Carolina, in a residence near his brother James Brown.  At that time only the heads of household's names were recorded.
At Elias Brown's home there was one free white male of 26 < 45 years (Elias), and one free white female 16 < 26 years old. Next door, at James Brown's home all the occupants were free and white. There were two males <10 (Hance and Amiel), one male 10<16 (Frederick), two males 16<18 (Isaac and William), two males of 16<26 including heads of families (Isaac and William), one male 26<45 (James), two females <10 (Elizabeth and Frances), two females 10<16 (Nancy and Jane), and one female >45 (Rebecca). (Names were correlated to their reported birth dates.)
The correlation of the ages of the family with those listed on the census makes the probability that this census relates to the family of James and Rebecca Brown very high. However, it cannot be considered certain. The Elias Brown family grew during the next ten years, three sons and a daughter were born.
Elias Brown, Home in 1830 Guilford, North Carolina.
Free White Persons - Males - Under 5: 2,
Free White Persons - Males - 5 thru 9: 1,
Free White Persons - Males - 40 thru 49: 1.
Free White Persons - Females - 5 thru 9: 1,
Free White Persons - Females - 30 thru 39: 1.
Free Colored Persons - Females - 10 thru 23: 1,
Free White Persons - Under 20: 4.
Free White Persons - 20 thru 49: 2.
Total Free White Persons: 6.
Total Free Colored Persons: 1.
Total - All Persons (Free White, Slaves, Free Colored): 7."
Elias Brown, Home in 1840, Guilford, North Carolina
Free White Persons - Males - 10 thru 14: 2,
Free White Persons - Males - 15 thru 19: 1,
Free White Persons - Males - 50 thru 59: 1,
Free White Persons - Females - Under 5: 1,
Free White Persons - Females - 5 thru 9: 2,
Free White Persons - Females - 10 thru 14: 1,
Free White Persons - Females - 15 thru 19: 1,
Free White Persons - Females - 30 thru 39: 1,
Persons Employed in Agriculture: 4,
Free White Persons - Under 20: 8,
Free White Persons - 20 thru 49: 1,
Total Free White Persons: 10,
Total All Persons - Free White, Free Colored, Slaves: 10." The four children from the 1830 census continue to be recorded, along with three more daughters in 1840.
Elias Brown is not found in the 1850 census records in Guilford County, North Carolina, and no other known record has been found. It is suspected that he died before 1850.
The 1850 census for Guilford County, North Carolina included his widow, Hannah Brown, age 52; and these daughters: Selina Brown, 16; Eusebia Brown, 13; and Sarah Brown, 10.  Records suggest Mary Brown (1831-1867) and Eucebia Brown (1837-1911), both, wives of William Gray were daughters of Elias Brown and Hannah Gardner.  Salina Brown Long (1832-1912) and Sarah Brown (1840-1890) were also their daughters. Mary Brown was living with her aunt, Marium Gardener, in 1850.  Harmon Brown (1824-1870) is considered a son of Elias and Hannah Brown. He married Martha J. Pitts in Guilford County, North Carolina in 1843. 
It may be possible to confirm family relationships with Elias by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: