1840-She married Joseph Hammell in Camden on 18 Oct. FHL film #1,543,472, Gloucester Co groom index: Joseph R Hammell of Camden was married to Mary Lock of Camden on 18 Oct 1840. They were married at Camden, Gloucester Co, by William A Brooks, minister, Methodist Episcopal Church, filed 17 Mar 1841. From Certificate of Gloucester Co.

1850-She is listed in the US Census taken on 14 Aug at the National Archives, film M-432 roll 445 p 2, NJ, Camden Co, North Ward of Camden City, dwelling #8, family #8, lines 11-16 as: Mary L Hamell, 28, female, born NJ, living with her husband, Joseph R, 30, son Charles, 8, son Richard, 6, son Howard, 4, and daughter Elizabeth, 1.

1860-She is listed in the US Census taken on 25 June 1860 at the National Archives, film T-653, roll 686, p 546, In Camden City, Camden Co, NJ, North Ward, dwelling #406, family #409, as: Mary L Hamel, 39, female, born NJ, living with Joseph R, 38, Richard, 15, Joseph R Jr, 8, Germon S, 6, Mary L, 4, Louis [sic], 6 months, Lois B Locke, 50 born NJ, & Maria Kenney, a servant.
There is a Lois Lock listed in the 1850 Census, First Ward, District of Spring garden, Philadelphia County, Pennsylvania, 26 Jul 1850, p 585 as:
Lois Lock, age 40, female, born New Jersey, living at dwelling #79, family #88, living with John V Wilson, 38, a merchant born NJ, Emily, 28, Annie, 6, Emma, 4, Mary, 2, and Mary Wilson, 21. is this the same Lois Locke? How is Lois B Locke related to Mary L Lock?

1870 - Listed in the US Census, p 78 or 48, District 25, Newton township, Gloucester City post office, New Jersey, Camden County, lines 32-39 taken 16 Aug 1870, house #791, family #886 as:
Hamell, Joseph R, 49, male, white, engineer, value of real estate $500, born NJ, male citizen of the US
Hamell, Mary L, 45, female, white, keeping house, born PA
Hamell, Charles H., 27, male, white, fireman, born NJ, male citizen of the US
Hamell, Richard E, 24, amle, white, no occupation given, born NJ, male citizen of the US
Hamell, Joseph R Jr, 24, male, white, apprentice to brick union, born NJ
Hamell, Germon R, 15, male, white, born NJ, attended school within the year
Hamell, Mary L Jr, 13, female, white, born NJ, deaf & dumb
Hamell, Loie B, 9, female, white, born NJ, attended school within the year

1880 -Listed in the US Census, NJ, city & county of Camden, 3rd ward 2nd precinct, taken on 10 Jun 1880, sup dist #3, ed f 45? p 160, lines 7-11 as:
Wrifford, Charles K, white, male, 24, head of household, married, salesman, born Pennsylvania, parents birthplace not given
living with:
Wrifford, Lois, white female, 24?, wife, married, keeping house, born NJ, father born NJ, mother born PA,
Wrifford, Cladius, white male, 3, son, born NJ, father born NJ, mother born PA
Wrifford, Margaret, white, female, 1, daughter born NJ, father born NJ, mother born PA
Hammell, Mary L, white female, 60, mother-in-law, widowed, born PA, both parents born PA

1885 - Listed in the New Jersey State Census, 3rd Ward of Camden city, Camden County, page 102:
Charles K Wrifford, white male, age 20-60
[his wife] Louisa B Wrifford, white female, age 20-60
[his daughter] Maggie D Wrifford, white female, age 5-20
[his daughter] Elsie R Wrifford, white female, age 5-20
[his daughter] Edna S Wrifford, white female, 5 years and under [sic Edna & Elsie were twins, so they should have been in the same age bracket]
[his brother-in-law] Joseph R Hammell, white male, age 20-60
[his mother-in-law] Mary L Hammell, white female, age over 60

1887-88, 1888-89 & 1890-91: -She is listed in the Camden, NJ City directory as Mary L Hammell, widow of Joseph R, 402 Berkley, Camden, NJ.

On September 12, 1891, Mary L., widow of the late Joseph R. Hammell. Relatives and friends of the family are respectfully invited to attend the funeral on Monday afternoon at 3 o'clock, from the residence of her son-in-law, Charles K. Wrifford, southeast corner of Fourth and Berkley streets, Camden, NJ. To proceed to Evergreen Cemetery.
Mary L Hammell, died 12 Sep 1891 in Pennsylvania, buried Evergreen Cemetery, Camden, NJ.