Mary Nicholson — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Jefferson-County, Kentucky

Our Model Tree links this Mary Nicholson across the 1920, 1930 and 1940 US Censuses in Jefferson-County, Kentucky (XGBoost, ~Confirmed) — first a head (b.~1861), then head of a 2-person household.

Age 79 b. ~1861 Female Head Born: Kentucky Widowed

1940 Census Record Details

Census Year	1940
Location	Jefferson-County, Kentucky
Surname	Nicholson
Given Name	Mary
Relationship to Head	Head
Sex	F
Color / Race	White
Age	79
Marital Status	Widowed
Birthplace	Kentucky
1935 Residence (City)	Louisville City
1935 Residence (County)	Jefferson
Additional Details
Industry	H
Income (1939)	0
Highest Grade	No 8
1935 Residence	Same house
Birth State	Kentucky
Birth Country	United States
Birthplace (normalized)	kentucky
Township / Ward	Louisville City
Est. Birth Year	~1861

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.

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

Name	Relation to head	Relative to Mary	Age	Birth yr
Mary Nicholson	Head	—	79	~1861
Lillian Nicholson	Daughter	—	55	~1885

Census Appearances

1920

Jefferson, Kentucky

Head, age 57

Jefferson, Kentucky · implied b. ~1863 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Nicholson
Given Name	Mary
Relationship to Head	head
Sex	F
Color / Race	White
Age	57
Marital Status	Widowed
Birthplace	Kentucky
Father's Birthplace	Kentucky
Mother's Birthplace	Indiana
Occupation	none
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Home Owned/Rented	R
Birth State	Kentucky
Birth Country	United States
Birthplace (normalized)	kentucky

1930

Jefferson, Kentucky

Other, age 69

Jefferson, Kentucky · implied b. ~1861 — 4 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Nicholson
Given Name	Mary
Relationship to Head	Head-H
Sex	F
Color / Race	White
Age	69
Marital Status	Widowed
Birthplace	Kentucky
Father's Birthplace	Kentucky
Mother's Birthplace	Indiana
Occupation	none
Can Read/Write	Yes
Home Owned/Rented	R
Home Value / Rent	35
Birth State	Kentucky
Birth Country	United States
Birthplace (normalized)	kentucky

1940

Jefferson-County, Kentucky

Head, age 79

Jefferson-County, Kentucky · implied b. ~1861 — 2 household members

Surname	Nicholson
Given Name	Mary
Relationship to Head	Head
Sex	F
Color / Race	White
Age	79
Marital Status	Widowed
Birthplace	Kentucky
1935 Residence (City)	Louisville City
1935 Residence (County)	Jefferson
Industry	H
Income (1939)	0
Highest Grade	No 8
1935 Residence	Same house
Birth State	Kentucky
Birth Country	United States
Birthplace (normalized)	kentucky

Model Tree

Linked across censuses

Our Model Tree links Mary Nicholson 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 Nicholson

Head · 1940 · age 79 · b. ~1861 · Kentucky

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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 — Jefferson-County, Kentucky Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-01366-00128)

Line	Name	Age	Relation	Occupation	Birthplace
1	Raymond Frazer	42	Head	Contractor	Pennsylvania
2	Thelma Frazer	43	Wife	—	Michigan
3	Phillip Frazer	20	Son	—	Pennsylvania
4	Anna Frazer	19	Daughter	—	Pennsylvania
5	Rebecca Waechter	89	Head	—	Kentucky
6	Carrie M. Waechter	60	Daughter	—	Kentucky
7	Julia Jill Waechter	53	Son	—	Kentucky
8	H. Lorena Finney	57	Lodger	Dress Maker	Indiana
9	Harry Bloom	48	Head	Writer	Kentucky
10	Leah Bloom	48	Wife	—	Tennessee
11	Sara Lee Bloom	20	Daughter	—	Kentucky
12	Harriet Bloom	17	Daughter	—	Kentucky
13	Susanna Steinitz	17	Lodger	—	Germany
14	Francis Newman	39	Head	Salesman	Kentucky
15	Ruby A. Newman	33	Wife	—	Virginia
16	Robert Newman	15	Son	—	Kentucky
17	Opal Coley	31	Sister	Saleslady	Oklahoma
18	Abe Gold	55	Head	Owner	Poland
19	Bertha Gold	55	Wife	—	Poland
20	Harold Gold	31	Son	Proprietor	Ohio
21	Nolan Mcmullin	63	Head	—	Kentucky
22	Harriett Mcmullin	57	Wife	—	Illinois
23	Magdalena Stod	34	Lodger	Comptometer Operator	Pennsylvania
24	Mary Wheat	73	Head	—	Kentucky
25	Mina R. Scheurer	80	Lodger	—	Kentucky
26	Mary Mcdevitt	60	Head	—	Kentucky
27	Mary Nicholson THIS PERSON	79	Head	—	Kentucky
28	Lillian Nicholson	55	Daughter	Saleslady	Kentucky
29	Amelia Hulswede	78	Head	—	Kentucky
30	Robert Johnson	72	Head	Salesman	Kentucky
31	Della Johnson	70	Wife	—	Kentucky
32	John Roth	39	Head	Policeman	Kentucky
33	Kathleen Roth	41	Wife	—	Tennessee
34	William Roth	18	Son	Paper Steamer	Kentucky
35	Helen Roth	15	Daughter	—	Kentucky
36	Florence Roth	11	Daughter	—	Kentucky
37	Edward Kaiser	48	Head	Civil Engineer	Kentucky
38	Elizabeth Kaiser	42	Wife	—	Tennessee
39	Margaret Lehr	27	Daughter	—	Tennessee
40	Earl Lehr	24	Son	Boiler Maker	Tennessee

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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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