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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 1930 and 1940 US Censuses in Allegheny-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1909), then head of a 8-person household.
Age 31
b. ~1909
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Allegheny-County, Pennsylvania |
| Surname | Smith |
| Given Name | Lydia |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Additional Details | |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1700 |
| Highest Grade | C-4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Teacher |
| Township / Ward | Pittsburgh |
| Est. Birth Year | ~1909 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Lydia | Age | Birth yr |
|---|---|---|---|---|
| Olive Smith | Daughter | — | 16 | ~1924 |
| Florence Smith | Daughter | — | 35 | ~1905 |
| Lydia Smith | Daughter | — | 31 | ~1909 |
| Stewart Smith | Head | — | 59 | ~1881 |
| Robert Gibson | Other | — | 45 | ~1895 |
| Turau Bykal | Other | — | 19 | ~1921 |
| Edgar Smith | Son | — | 19 | ~1921 |
| Lucretia Smith | Spouse | — | 57 | ~1883 |
Census Appearances
1930
Allegheny, Pennsylvania
Daughter, age 20
Allegheny, Pennsylvania · implied b. ~1910 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Lydia |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| Age at First Marriage | 16 |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Allegheny-County, Pennsylvania
Daughter, age 31
Allegheny-County, Pennsylvania · implied b. ~1909 — 8 household members
| Surname | Smith |
| Given Name | Lydia |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Pittsburgh |
| 1935 Residence (County) | Allegheny |
| Occupation | Teacher |
| Industry | Public School |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1700 |
| Highest Grade | C-4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Lydia Smith
Daughter · 1940 · age 31 · b. ~1909 · Pennsylvania
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Sibling
Florence Smith
Sibling · 1940 · age 35
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edgar Smith
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Olive Smith
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
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-t0627-03655-00523)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Josephine B. Conroy | 68 | Head | — | Pennsylvania |
| 42 | Elizabeth Bell | 66 | Sister | — | Pennsylvania |
| 43 | Marguerite Howell | 61 | Sister | — | Pennsylvania |
| 44 | Isabel Bell | 58 | Sister | — | Pennsylvania |
| 45 | Jean D. Dressler | 41 | Head | Music Teacher | Pennsylvania |
| 46 | John Kress | 27 | Head | Sales-Automobiles | Pennsylvania |
| 47 | Esther Kress | 23 | Wife | — | Massachusetts |
| 48 | Stewart M. Smith | 59 | Head | — | New Jersey |
| 49 | Lucretia Smith | 57 | Wife | — | Massachusetts |
| 50 | Florence Smith | 35 | Daughter | Teacher | Pennsylvania |
| 51 | Lydia Smith THIS PERSON | 31 | Daughter | Teacher | Pennsylvania |
| 52 | Edgar W. Smith | 19 | Son | — | Pennsylvania |
| 53 | Olive L. Smith | 16 | Daughter | — | Pennsylvania |
| 54 | Robert Gibson | 45 | Lodger | Carpenter | Pennsylvania |
| 55 | Turau B. Bykal | 19 | Lodger | — | Turkey |
| 56 | Elizabeth R. Potter | 50 | Head | — | Pennsylvania |
| 57 | Phyllis Potter | 25 | Daughter | — | Pennsylvania |
| 58 | Louise Potter | 20 | Daughter | — | Pennsylvania |
| 59 | Robert A. Lyne | 50 | Head | Salesman | Pennsylvania |
| 60 | Helen W. Lyne | 48 | Wife | — | Pennsylvania |
| 61 | Virginia B.R. Lyne | 23 | Daughter | — | Pennsylvania |
| 62 | Frances C. Lyne | 18 | Daughter | — | Pennsylvania |
| 63 | Helen W. Lyne | 12 | Daughter | — | Pennsylvania |
| 64 | Robert A. Lyne | 10 | Son | — | Pennsylvania |
| 65 | Barbara Loderneir | 21 | Maid | Maid Of-All-Work | Minnesota |
| 66 | Anne Gernick | 23 | Maid | Cook | Pennsylvania |
| 67 | James M. Graham | 47 | Head | Lawyer | Pennsylvania |
| 68 | Mary L. Graham | 43 | Wife | — | Virginia |
| 69 | James M. Jr. Graham | 13 | Son | — | Pennsylvania |
| 70 | William P.B. Graham | 10 | Son | — | Pennsylvania |
| 71 | Isabel L. Graham | 6 | Daughter | — | Pennsylvania |
| 72 | Alexander Blair | 30 | Head | Vendor-Sales | Pennsylvania |
| 73 | Louise E. Blair | 24 | Wife | — | Pennsylvania |
| 74 | Lucille Spengberg | 31 | Maid | General Maid | Pennsylvania |
| 75 | Charles O. Tallman | 56 | Head | Sales-Broker | Maryland |
| 76 | Margaret Tallman | 46 | Wife | — | Pennsylvania |
| 77 | Margaret Tallman | 22 | Daughter | — | Pennsylvania |
| 78 | Oscar W. Conrad | 70 | Head | — | Pennsylvania |
| 79 | Nettie P. Conrad | 65 | Wife | — | Pennsylvania |
| 80 | R. Low Britton | 29 | Son | Clerk | 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)