Mary Blackburn — 1940 US Census Record

Linked across censuses

1940 United States Federal Census · Pike-County, Indiana

Our Model Tree links this Mary Blackburn across the 1920, 1930 and 1940 US Censuses in Pike-County, Indiana (XGBoost, ~Confirmed) — first a head (b.~1864), then head of a 2-person household.

Age 76 b. ~1864 Female Head Born: Indiana Widowed

1940 Census Record Details

Census Year	1940
Location	Pike-County, Indiana
Surname	Blackburn
Given Name	Mary M.
Relationship to Head	Head
Sex	F
Color / Race	White
Age	76
Marital Status	Widowed
Birthplace	Indiana
1935 Residence (City)	Petersburg city
1935 Residence (County)	Pike
Additional Details
Occupation	Proprietor
Industry	Retail Grocery Store
Class of Worker	OA
Hours Worked	75
Income (1939)	0
Highest Grade	6
1935 Residence	Same place
Birth State	Indiana
Birth Country	United States
Birthplace (normalized)	indiana
Occupation	Proprietor
Township / Ward	Petersburg City
Est. Birth Year	~1864

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
Perry Rumble	Son	—	54	~1886
Mary Blackburn	Head	—	76	~1864

Census Appearances

1920

Pike, Indiana

Spouse, age 54

Pike, Indiana · implied b. ~1866 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Blackburn
Given Name	Mary M
Relationship to Head	Wife
Sex	F
Color / Race	White
Age	54
Marital Status	Married
Birthplace	Indiana
Father's Birthplace	Germany
Mother's Birthplace	Germany
Can Read	Yes
Can Write	Yes
Speaks English	Yes
Birth State	Indiana
Birth Country	United States
Birthplace (normalized)	indiana

1930

Pike, Indiana

Other, age 65

Pike, Indiana · implied b. ~1865 — 2 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Blackburn
Given Name	Mary M.
Relationship to Head	Wife-H
Sex	F
Color / Race	White
Age	65
Marital Status	Married
Birthplace	Indiana
Age at First Marriage	19
Father's Birthplace	Germany
Mother's Birthplace	Germany
Occupation	Teamster
Industry	Trucking
Class of Worker	OA
Can Read/Write	Yes
Veteran	No
Birth State	Indiana
Birth Country	United States
Birthplace (normalized)	indiana

1940

Pike-County, Indiana

Head, age 76

Pike-County, Indiana · implied b. ~1864 — 2 household members

Surname	Blackburn
Given Name	Mary M.
Relationship to Head	Head
Sex	F
Color / Race	White
Age	76
Marital Status	Widowed
Birthplace	Indiana
1935 Residence (City)	Petersburg city
1935 Residence (County)	Pike
Occupation	Proprietor
Industry	Retail Grocery Store
Class of Worker	OA
Hours Worked	75
Income (1939)	0
Highest Grade	6
1935 Residence	Same place
Birth State	Indiana
Birth Country	United States
Birthplace (normalized)	indiana

Model Tree

Linked across censuses

Our Model Tree links Mary Blackburn 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 Blackburn

Head · 1940 · age 76 · b. ~1864 · Indiana

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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 — Pike-County, Indiana Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-01085-00389)

Line	Name	Age	Relation	Occupation	Birthplace
1	Ralph Jr. Evans	17	Son	—	Indiana
2	Lola Evans	16	Daughter	—	Indiana
3	Samuel Gross	51	Head	Proprietor	Michigan
4	Rose Gross	44	Wife	Saleslady	Illinois
5	Moss Ab Gross	19	Son	—	Indiana
6	Loren Gross	3	Son	—	Kentucky
7	Cedna Determan	48	Head	—	Indiana
8	Thomas H. Fleming	33	Head	Shovel Runner	Indiana
9	Reta Fleming	32	Wife	—	Indiana
10	Thomas Fleming	7	Son	—	Indiana
11	Everett Fleming	6	Son	—	Indiana
12	John E. Howard	46	Head	Salesman	Indiana
13	Margaret Howard	36	Wife	Housekeeping	Illinois
14	Pauline Howard	17	Daughter	—	Indiana
15	Eugene Howard	13	Son	—	Indiana
16	Maxine Howard	7	Daughter	—	Indiana
17	Marcella Gladish	4	Granddaughter	—	Indiana
18	George R. English	49	Head	Traveling Salesman	Indiana
19	Magdalene English	39	Wife	—	Indiana
20	Donald English	1	Son	—	Indiana
21	Samuel G. West	50	Head	—	Indiana
22	Cora West	46	Wife	Laundress	Indiana
23	Fred West	24	Son	Rod Carrier	Indiana
24	Samuel Jr. West	17	Son	School Building Cleaning	Indiana
25	Anna West	15	Daughter	—	Indiana
26	Barker Barrett	34	Lodger	Painter	Indiana
27	Elmo Morton	23	Head	Electrician	Indiana
28	Marie Morton	20	Wife	—	Indiana
29	Mary M. Blackburn THIS PERSON	76	Head	Proprietor	Indiana
30	Perry Rumble	54	Son	Laborer	Indiana
31	Verner Preston	51	Head	Assessor	Indiana
32	Theora Preston	44	Wife	—	Indiana
33	Zella Preston	24	Daughter	—	Indiana
34	Wanda Preston	17	Daughter	—	Indiana
35	Adrian Preston	15	Son	—	Indiana
36	Orval Swain	41	Head	Laborer	Indiana
37	Lura Swain	43	Wife	—	Indiana
38	Noble Swain	21	Son	Laborer	Indiana
39	Harold Swain	11	Son	—	Indiana
40	Loretta Swain	10	Daughter	—	Indiana

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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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