Mary Black — 1940 US Census Record

Model Tree available

1940 United States Federal Census · Franklin-County, Ohio

Our Model Tree links this Mary Black across the 1920, 1930 and 1940 US Censuses in Franklin-County, Ohio (XGBoost, ~Confirmed), with identified parents Walter & Blanche — first a daughter (b.~1919), then head of a 4-person household.

Age 21 b. ~1919 Female Daughter Born: Ohio Single

1940 Census Record Details

Census Year	1940
Location	Franklin-County, Ohio
Surname	Black
Given Name	Mary
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	21
Marital Status	Single
Birthplace	Ohio
1935 Residence (City)	Columbus
1935 Residence (County)	Franklin
Additional Details
Highest Grade	H-4
1935 Residence	Same place
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio
Township / Ward	Columbus
Est. Birth Year	~1919

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.

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

Name	Relation to head	Relative to Mary	Age	Birth yr
Mary Black	Daughter	—	21	~1919
Walter Leffler	Head	—	54	~1886
R Walker	Other	—	22	~1918
Blanche Leffler	Spouse	—	45	~1895

Census Appearances

1920

Franklin, Ohio

Other, age 1

Franklin, Ohio · implied b. ~1919 — 6 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Black
Given Name	Maryjane F.
Relationship to Head	Granddaughter
Sex	F
Color / Race	White
Age	1
Marital Status	Single
Birthplace	Ohio
Father's Birthplace	Ohio
Mother's Birthplace	Ohio
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

1930

Franklin, Ohio

Other, age 11

Franklin, Ohio · implied b. ~1919 — 3 household members

● Primary link · ~Confirmed · 2 sources

XGBoost Household

Surname	Block
Given Name	Mary E.
Relationship to Head	mother-in-law
Sex	F
Color / Race	White
Age	11
Marital Status	Single
Birthplace	Ohio
Father's Birthplace	Ohio
Mother's Birthplace	Ohio
Occupation	none
Can Read/Write	Yes
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

1940

Franklin-County, Ohio

Daughter, age 21

Franklin-County, Ohio · implied b. ~1919 — 4 household members

Surname	Black
Given Name	Mary
Relationship to Head	Daughter
Sex	F
Color / Race	White
Age	21
Marital Status	Single
Birthplace	Ohio
1935 Residence (City)	Columbus
1935 Residence (County)	Franklin
Highest Grade	H-4
1935 Residence	Same place
Birth State	Ohio
Birth Country	United States
Birthplace (normalized)	ohio

Model Tree

Model Tree available

Our Model Tree links Mary Black across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Walter Leffler (~0.92 confidence) and mother Blanche Leffler (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.

Show:

Gen 1 Parents confidence ≈ 0.92

Father

Walter Leffler

b. ~1886

Source father

● Household · direct · ~0.92

Mother

Blanche Leffler

b. ~1895

Source mother

● Household · direct · ~0.92

This person

Anchor record

Mary Black

Daughter · 1940 · age 21 · b. ~1919 · Ohio

★ You are viewing this record

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

Original Census Page

1940 US Federal Census — Franklin-County, Ohio Open full size

Page Contents

40 people indexed on this census page (nara:1940:m-t0627-03250-00646)

Line	Name	Age	Relation	Occupation	Birthplace
1	Walter W Leffler	54	Head	Interior Decorator	Ohio
2	Blanche X Leffler	45	Wife	Cook	Ohio
3	Mary Black THIS PERSON	21	Daughter	—	Ohio
4	R Walker	22	Son-in-law	Handy Man	Pennsylvania
5	Earl F Caukina	54	Head	Carpenter	Ohio
6	Ethel B Caukina	50	Wife	Clerk & Telephone In Doctor'S Office	Ohio
7	George W Robinson	60	Head	Freight Brakeman	Ohio
8	Mabel R Robinson	56	Wife	—	Ohio
9	William J Robinson	20	Son	—	Ohio
10	George F Mcdunniff	69	Head	Carpenter	Ohio
11	Armath X Mcdunniff	68	Wife	—	Ohio
12	Zula Mcdunniff	41	Daughter	Typing Secretary	Ohio
13	Mary Mcdunniff	40	Daughter	Secretary	Ohio
14	Lillian Mcdunniff	35	Daughter	Teacher	Ohio
15	Henry C Mcdunniff	34	Son	Salesman	Ohio
16	I Earl White	58	Head	Optometrist	Ohio
17	Francis X White	57	Wife	—	Ohio
18	Earl L White	19	Son	—	Ohio
19	Kate Mccordell	82	Mother-in-law	—	Ohio
20	Christine Mccordell	53	Sister-in-law	Teller	Ohio
21	Emma X Sever	73	Head	—	Ohio
22	Bertha Sever	70	Sister	—	Ohio
23	Clark Walker	42	Servant	Houseman	Ohio
24	William A X Sanders	61	Head	Real Estate Salesman	Pennsylvania
25	Amy Rowan	52	Lodger	—	Pennsylvania
26	Mary Morgan	62	Lodger	Nurse Maid	Ohio
27	Charlotte Douglas	49	Lodger	—	Ohio
28	Edward E X Heishman	57	Head	Candy Company Owner	Ohio
29	Phoebe Heishman	55	Wife	Secretary	Ohio
30	Clarence Bartholmes	50	Head	Contractor	Ohio
31	Eleanor X Bartholmes	45	Wife	Industrial Nurse	Ohio
32	John X Chevallard	64	Head	Real Estate Agent	Ohio
33	Rena P Chevallard	64	Wife	Alteration Seamstress	Ohio
34	Madeline Chevallard	25	Daughter	Singer	Ohio
35	Philip Chevallard	34	Son	Milk Truck Driver	Ohio
36	Ruth Chevallard	25	Daughter-in-law	—	Tennessee
37	Frank S Kuklan	53	Head	Gas & Oil Salesman	Ohio
38	Hulda C X Kuklan	47	Wife	—	Ohio
39	Charles G Kuklan	24	Son	Chemist	Ohio
40	Thelma Kuklan	17	Daughter	—	Ohio

Search for Mary Black

All Mary Black Census Records Discover Black Family Tree

Pedigree Summary

Mary

Gen 1 · 2 parents ~0.92

Max depth 4 (1900–1950 window)

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)

Report inaccurate data