Mary Johnson — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Duval-County, Florida

Our Model Tree links this Mary Johnson across the 1920, 1930 and 1940 US Censuses in Duval-County, Florida (XGBoost, ~Confirmed) — first a spouse (b.~1896), then head of a 7-person household.

Age 44 b. ~1896 Female Spouse Born: Florida Married

1940 Census Record Details

Census Year	1940
Location	Duval-County, Florida
Surname	Johnson
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	Black
Age	44
Marital Status	Married
Birthplace	Florida
1935 Residence (City)	Jacksonville
1935 Residence (County)	Duval
Additional Details
Occupation	Cook
Industry	Cafeteria
Class of Worker	PW
Hours Worked	45
Income (1939)	720
Highest Grade	No 8
1935 Residence	Same Place
Birth State	Florida
Birth Country	United States
Birthplace (normalized)	florida
Occupation	Cook
Township / Ward	Jacksonville
Est. Birth Year	~1896

Household Members

Census records only state relationship to the household head. Pairwise kinship is derived (~90–95% accurate), not recorded. Step/blended families and boarders can break it.

7 people recorded at the same address in the 1940 census.

Name	Relation to head	Relative to Mary	Age	Birth yr
Annette Moss	Daughter	—	4	~1936
Grace Brown	Daughter	—	22	~1918
Wm Johnson	Head	—	48	~1892
Luther Moss	Other	—	37	~1903
Harry Brown	Other	—	2	~1938
Dolly Moss	Spouse	—	33	~1907
Mary Johnson	Spouse	—	44	~1896

Census Appearances

1920

Duval, Florida

Other, age 27

Duval, Florida · implied b. ~1893 — 5 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Johnson
Given Name	Mary
Relationship to Head	Roomer
Sex	F
Color / Race	Black
Age	27
Marital Status	Married
Birthplace	Florida
Father's Birthplace	Georgia
Mother's Birthplace	Georgia
Occupation	Maid
Industry	Private Family
Class of Worker	W
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	Florida
Birth Country	United States
Birthplace (normalized)	florida

1930

Duval, Florida

Other, age 35

Duval, Florida · implied b. ~1895 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Johnson
Given Name	Mary
Relationship to Head	Head-H
Sex	F
Color / Race	Black
Age	35
Marital Status	Married
Birthplace	Florida
Age at First Marriage	18
Father's Birthplace	Florida
Mother's Birthplace	Florida
Occupation	Cook
Industry	Private family
Class of Worker	W
Can Read/Write	Yes
Birth State	Florida
Birth Country	United States
Birthplace (normalized)	florida

1940

Duval-County, Florida

Spouse, age 44

Duval-County, Florida · implied b. ~1896 — 7 household members

Surname	Johnson
Given Name	Mary
Relationship to Head	Wife
Sex	F
Color / Race	Black
Age	44
Marital Status	Married
Birthplace	Florida
1935 Residence (City)	Jacksonville
1935 Residence (County)	Duval
Occupation	Cook
Industry	Cafeteria
Class of Worker	PW
Hours Worked	45
Income (1939)	720
Highest Grade	No 8
1935 Residence	Same Place
Birth State	Florida
Birth Country	United States
Birthplace (normalized)	florida

Model Tree

Linked across censuses

Our Model Tree links Mary Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.

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This person

Anchor record

Mary Johnson

Spouse · 1940 · age 44 · b. ~1896 · Florida

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Confirmed / household (~0.90+) Probable / derived (~0.65–0.89) Candidate (<0.65, unverified)

Original Census Page

1940 US Federal Census — Duval-County, Florida Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-00625-00313)

Line	Name	Age	Relation	Occupation	Birthplace
41	Mollie Robison	68	Head	—	Florida
42	Robert Heady	52	Nephew	Chauffeur	Florida
43	Onesta Heady	52	Niece	Teacher	Florida
44	Wm L Johnson	48	Head	Plasterer	Florida
45	Mary Johnson THIS PERSON	44	Wife	Cook	Florida
46	Grace Brown	22	Daughter	—	Florida
47	Harry Brown	2	Grand-son	—	Florida
48	Luther Moss	37	Lodger	Meat Packer	Florida
49	Dolly Moss	33	Wife	Maid	Georgia
50	Annette Moss	4	Daughter	—	Florida
51	Beatrice White	33	Head	Maid	Georgia
52	Chas White	12	Son	—	Florida
53	Annie Mildred White	10	Daughter	—	Florida
54	Beatrice White	8	Daughter	—	Florida
55	Eugene White	6	Son	—	Florida
56	Jack Glass	39	Head	Truckman	Georgia
57	Marie Glass	29	Wife	Maid	Georgia
58	Rosalie Glass	14	Daughter	—	Florida
59	Allen Glass	9	Son	—	Florida
60	Emma May Thomas	23	Head	Cook-Maid	Florida
61	Lewis Thomas	5	Son	—	Florida
62	Herrick Thomas	20	Brother	Janitor	Florida
63	James Williams	13	Brother	—	Florida
64	Emma May Williams	10	Sister	—	Florida
65	Arthur Jessie	36	Head	Truck Driver	Florida
66	Lizzie Jessie	32	Wife	Maid	Georgia
67	Eliza Cotton	31	Head	Stevedore	Georgia
68	Marie Cotton	27	Wife	—	Florida
69	Henry B Smith	11	Son	—	Florida
70	William Smith	7	Son	—	Florida
71	Howard Berry	22	Brother-in-law	Truck Driver	Florida
72	Amy Berry	23	Sister-in-law	Waitress	Florida
73	Geraldine Mccoy	28	Head	Cook	Florida
74	Will Mobley	50	Head	Laborer	Florida
75	Jessie May Mobley	22	Wife	—	Georgia
76	Louise Mobley	3	Daughter	—	Florida
77	W. M. Mobley	2	Son	—	Florida
78	Bernice Mobley	1	Daughter	—	Florida
79	Elize Sr. Croomie	56	Head	Truck Driver	Carolina
80	Mamie Croomie	53	Wife	Laundress	Georgia

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About This Record & Model Tree

This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.

Source: National Archives and Records Administration (NARA)

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