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Joan Smith — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Joan Smith across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 6-person household.
Age 12
b. ~1928
Female
Daughter
Born: Penna
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | Smith |
| Given Name | Joan Laughlin |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Penna |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Additional Details | |
| Highest Grade | Hs 1 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1928 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Joan | Age | Birth yr |
|---|---|---|---|---|
| Densley Smith | Son | — | 10 | ~1930 |
| Dorothy Smith | Spouse | — | 36 | ~1904 |
| David Smith | Son | — | 5 | ~1935 |
| Leola Williams | Other | — | 25 | ~1915 |
| Joan Smith | Daughter | — | 12 | ~1928 |
| Densley Smith | Head | — | 39 | ~1901 |
Census Appearances
1930
Philadelphia, Pennsylvania
Daughter, age 1
Philadelphia, Pennsylvania · implied b. ~1929 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Joan |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Penna |
| Father's Birthplace | Penna |
| Mother's Birthplace | Penna |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
1940
Philadelphia-County, Pennsylvania
Daughter, age 12
Philadelphia-County, Pennsylvania · implied b. ~1928 — 6 household members
| Surname | Smith |
| Given Name | Joan Laughlin |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Penna |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Highest Grade | Hs 1 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
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 Joan Smith across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Joan Smith
Daughter · 1940 · age 12 · b. ~1928 · Pennsylvania
★ You are viewing this record
Sibling
Densley Smith
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Smith
Sibling · 1940 · age 5
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 — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03732-00234)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | May Matthews | 58 | Wife | — | Penna |
| 2 | Phyllis M Matthews | 31 | Daughter | Secretary | Penna |
| 3 | George Snyder | 56 | Head | Pump Mfg | Penna |
| 4 | Eliza Snyder | 54 | Wife | — | Penna |
| 5 | Maurice D Laughlin | 45 | Head | Attorney | Penna |
| 6 | Alice E Laughlin | 44 | Wife | — | Penna |
| 7 | Maurice D Jr Laughlin | 20 | Son | — | Penna |
| 8 | William E Laughlin | 18 | Son | — | Penna |
| 9 | Lillian Lyon | 38 | Lodger | Maid | Virginia |
| 10 | Wallace Lyon | 42 | Lodger | Houseman | Virginia |
| 11 | Oliver E Lewis | 51 | Head | Assessor | Virginia |
| 12 | Frances W Lewis | 50 | Wife | — | Virginia |
| 13 | Nereida Lewis | 4 | Block | — | Virginia |
| 14 | Catherine Hill | 25 | Lodger | Maid | Penna |
| 15 | Densley F Smith | 39 | Head | Manager | Illinois |
| 16 | Dorothy Edwards Smith | 36 | Wife | — | Illinois |
| 17 | Joan Laughlin Smith THIS PERSON | 12 | Daughter | — | Penna |
| 18 | Densley Smith | 10 | Son | — | Penna |
| 19 | David Smith | 5 | Son | — | Penna |
| 20 | Leola Williams | 25 | Lodger | Maid | Georgia |
| 21 | Frances A Maulden | 31 | Head | Buyer | Washington |
| 22 | Alvera S Maulden | 33 | Wife | Buyer | Penna |
| 23 | Frances A Jr Maulden | 1 | Son | — | Penna |
| 24 | Lloyd A Goof | 58 | Head | Production Mgr | Illinois |
| 25 | Clara E Goof | 40 | Wife | — | Maryland |
| 26 | Lloyd A Jr Goof | 9 | Son | — | Penna |
| 27 | Allan E Goof | 8 | Son | — | Penna |
| 28 | Alonzo Outer | 47 | Lodger | Butler | Maryland |
| 29 | Anna Outer | 44 | Lodger | Maid | Maryland |
| 30 | William S Hill | 50 | Head | Manager | Penna |
| 31 | Rachel Hill | 45 | Wife | — | Penna |
| 32 | Jane Hill | 18 | Daughter | Secretary | Penna |
| 33 | William S Jr Hill | 16 | Son | — | Penna |
| 34 | Conrad Hellwege | 39 | Head | Pump Mfg | Penna |
| 35 | Barbara Hellwege | 32 | Wife | — | Penna |
| 36 | Conrad J Hellwege | 8 | Son | — | Penna |
| 37 | John P Hellwege | 5 | Son | — | Penna |
| 38 | Mathias Maull | 51 | Head | President | Penna |
| 39 | Julia K Maull | 51 | Wife | — | Penna |
| 40 | Virginia Maull | 23 | Daughter | — | Penna |
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)