LS
Lydia Smith — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Allegheny-County, Pennsylvania
Our Model Tree links this Lydia Smith across the 1920, 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a head (b.~1866), then head of a 2-person household.
Age 74
b. ~1866
Female
Head
Born: Ohio
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Smith |
| Given Name | Lydia |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 74 |
| Marital Status | Widowed |
| Birthplace | Ohio |
| 1935 Residence (City) | City of Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Township / Ward | City Of Pittsburgh |
| Est. Birth Year | ~1866 |
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 Lydia | Age | Birth yr |
|---|---|---|---|---|
| Lyda Smith | Daughter | — | 35 | ~1905 |
| Lydia Smith | Head | — | 74 | ~1866 |
Census Appearances
1920
Allegheny, Pennsylvania
Head, age 53
Allegheny, Pennsylvania · implied b. ~1867 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Lydia |
| Relationship to Head | head |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Widowed |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1930
Allegheny, Pennsylvania
Other, age 66
Allegheny, Pennsylvania · implied b. ~1864 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Lydia |
| Relationship to Head | Mother |
| Sex | F |
| Color / Race | White |
| Age | 66 |
| Marital Status | Widowed |
| Birthplace | Ohio |
| Age at First Marriage | 23 |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Can Read/Write | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Allegheny-County, Pennsylvania
Head, age 74
Allegheny-County, Pennsylvania · implied b. ~1866 — 2 household members
| Surname | Smith |
| Given Name | Lydia |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 74 |
| Marital Status | Widowed |
| Birthplace | Ohio |
| 1935 Residence (City) | City of Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links Lydia Smith across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Lydia Smith
Head · 1940 · age 74 · b. ~1866 · Pennsylvania
★ 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 — Allegheny-County, Pennsylvania
Open full size
1940 US Federal Census — Allegheny-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03670-00277)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Kraft | None | — | — | — |
| 2 | Ruth Mary Keft | 21 | Daughter | — | Pennsylvania |
| 3 | Catherine C. Dougherty | 63 | Head | — | Pennsylvania |
| 4 | William J. Dougherty | 59 | Brother | — | Pennsylvania |
| 5 | Mary Dougherty | 85 | Mother | Clerk | England |
| 6 | Charles K. Dougherty | 24 | Nephew | — | Pennsylvania |
| 7 | Milton J. Koffer | 44 | Head | — | Pennsylvania |
| 8 | Louise Koffer | 34 | Wife | Painter | Pennsylvania |
| 9 | Mildred Koffer | 18 | Daughter | — | Pennsylvania |
| 10 | Mary Koffer | 14 | Daughter | New Worker | Pennsylvania |
| 11 | Martha Koffer | 14 | Daughter | — | Pennsylvania |
| 12 | Betty Koffer | 11 | Daughter | — | Pennsylvania |
| 13 | Nancy Koffer | 9 | Daughter | — | Pennsylvania |
| 14 | Robert H. Mcmanama | 29 | Head | Rail Way Mail Clerk | New Jersey |
| 15 | Maurice J. Mcmanama | 25 | Brother | Labor | Alabama |
| 16 | Clara R. Mcmanama | 65 | Mother | — | Pennsylvania |
| 17 | Forrest H. Mcmillen | 52 | Head | Electric Motorman | Pennsylvania |
| 18 | Edna M. Mcmillen | 41 | Wife | — | Pennsylvania |
| 19 | George Mcmillen | 18 | Son | — | Pennsylvania |
| 20 | Lydia Smith THIS PERSON | 74 | Head | — | Ohio |
| 21 | Lyda Smith | 35 | Daughter | — | Pennsylvania |
| 22 | Owen H. Copeland | 64 | Head | Stenographer | Ohio |
| 23 | Julia B. Copeland | 61 | Wife | Substitute Engineer | Pennsylvania |
| 24 | Charles H. Swope | 56 | Head | — | Pennsylvania |
| 25 | Lois B. Swope | 55 | Wife | Minister | Pennsylvania |
| 26 | Marie Cocker | 36 | Head | — | Pennsylvania |
| 27 | Katherine M. Cocker | 75 | Mother | Clerk | Pennsylvania |
| 28 | Charles J. Osborne | 66 | Head | — | Pennsylvania |
| 29 | Bernard C. Osborne | 33 | Son | — | Pennsylvania |
| 30 | William J. Menger | 24 | Head | Machinist | Pennsylvania |
| 31 | Aleta Menger | 24 | Wife | Heating Engineer | Pennsylvania |
| 32 | Donald M. Carroll | 32 | Head | — | Pennsylvania |
| 33 | Mary R. Carroll | 32 | Wife | Teacher | Pennsylvania |
| 34 | Donald Jr. Carroll | 8 | Son | — | Pennsylvania |
| 35 | Anna M. Rosboro | 68 | Mother-in-law | — | Pennsylvania |
| 36 | Willard Moore | 45 | Head | — | Pennsylvania |
| 37 | Catherine Q. Moore | 46 | Wife | Machinist | Pennsylvania |
| 38 | Jean Moore | 17 | Daughter | — | Pennsylvania |
| 39 | Ruth Moore | 16 | Daughter | — | Pennsylvania |
| 40 | Dorothy Moore | 10 | Daughter | — | Pennsylvania |
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)