ID
Isaac Davis — 1940 US Census Record
Model Tree available1940 United States Federal Census · Montgomery-County, Pennsylvania
Our Model Tree links this Isaac Davis across the 1910, 1920, 1930 and 1940 US Censuses in Montgomery-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents L & John — first a head (b.~1910), then head of a 7-person household.
Age 30
b. ~1910
Male
Head
Born: Pennsylvania
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Pennsylvania |
| Surname | Davis |
| Given Name | Isaac |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Norristown |
| 1935 Residence (County) | Montgomery |
| Additional Details | |
| Occupation | Foreman |
| Industry | Dairy |
| Class of Worker | PW |
| Hours Worked | 56 |
| Income (1939) | 1650 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Foreman |
| Township / Ward | Norristown |
| Est. Birth Year | ~1910 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Isaac | Age | Birth yr |
|---|---|---|---|---|
| Carroll Davis | Son | — | 5 | ~1935 |
| Marjorie Dewees | Other | — | 21 | ~1919 |
| Anna Dewees | Other | — | 54 | ~1886 |
| Dorothy Davis | Spouse | — | 27 | ~1913 |
| Isaac Davis | Head | — | 30 | ~1910 |
| Diana Davis | Daughter | — | 7 | ~1933 |
| Edith Dewees | Other | — | 22 | ~1918 |
Census Appearances
1910
Montgomery, Pennsylvania
Son, age 1
Montgomery, Pennsylvania · implied b. ~1909 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Davis |
| Given Name | Isaac |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1920
Montgomery, Pennsylvania
Son, age 11
Montgomery, Pennsylvania · implied b. ~1909 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Davis |
| Given Name | Isaac |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Montgomery, Pennsylvania
Son, age 21
Montgomery, Pennsylvania · implied b. ~1909 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Davis |
| Given Name | Isaac J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Occupation | Cashier |
| Industry | Western Union |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Montgomery-County, Pennsylvania
Head, age 30
Montgomery-County, Pennsylvania · implied b. ~1910 — 7 household members
| Surname | Davis |
| Given Name | Isaac |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Norristown |
| 1935 Residence (County) | Montgomery |
| Occupation | Foreman |
| Industry | Dairy |
| Class of Worker | PW |
| Hours Worked | 56 |
| Income (1939) | 1650 |
| Highest Grade | Hs 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 Isaac Davis across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father L Davis (~0.92 confidence) and father John Davis (~0.92 confidence) and father John Davis (~0.92 confidence) and mother Ida Davis (~0.92 confidence) and mother L Davis (~0.92 confidence) and mother Clara Davis (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
L Davis
b. ~1878
Source father
● Household
· direct · ~0.92
Father
John Davis
b. ~1879
Source father
● Household
· direct · ~0.92
Father
John Davis
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Ida Davis
b. ~1881
Source mother
● Household
· direct · ~0.92
Mother
L Davis
b. ~1881
Source mother
● Household
· direct · ~0.92
Mother
Clara Davis
b. ~1882
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Isaac Davis
Head · 1940 · age 30 · b. ~1910 · 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 — Montgomery-County, Pennsylvania
Open full size
1940 US Federal Census — Montgomery-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03582-00373)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Catherine James | 37 | Wife | Secretary | Pennsylvania |
| 42 | Clifford G. Groff | 53 | Head | Collector | Pennsylvania |
| 43 | Dorothy L. Groff | 23 | Daughter | — | Pennsylvania |
| 44 | Clifford L. Groff | 19 | Son | Attendant | Pennsylvania |
| 45 | Karl F. Sr. Mulley | 54 | Head | Salesman | Pennsylvania |
| 46 | Florence V. Mulley | 54 | Wife | — | Pennsylvania |
| 47 | Pearl Vandenlice | 18 | Maid | Maid | Pennsylvania |
| 48 | Francis Peacock | 31 | Lodger | Carpenter | Pennsylvania |
| 49 | Dorothy Peacock | 29 | Wife | — | Pennsylvania |
| 50 | Dorothy A. Peacock | 2 | Daughter | — | Pennsylvania |
| 51 | Margaret Rodenbaugh | 40 | Head | Mender | Pennsylvania |
| 52 | Robert Rodenbaugh | 20 | Son | Shipping Clerk | Pennsylvania |
| 53 | Margaret Rodenbaugh | 19 | Daughter | Housework | Pennsylvania |
| 54 | Raymond Rodenbaugh | 18 | Son | — | Pennsylvania |
| 55 | Ronald Rodenbaugh | 17 | Son | — | Pennsylvania |
| 56 | Thomas Packel | 42 | Head | Salesman | Pennsylvania |
| 57 | Frances Packel | 25 | Wife | — | Pennsylvania |
| 58 | Isaac Davis THIS PERSON | 30 | Head | Foreman | Pennsylvania |
| 59 | Dorothy M. Davis | 27 | Wife | Housework | Pennsylvania |
| 60 | Diana Davis | 7 | Daughter | — | Pennsylvania |
| 61 | Carroll Davis | 5 | Son | — | Pennsylvania |
| 62 | Anna M. Dewees | 54 | Mother | — | Pennsylvania |
| 63 | Edith B. Dewees | 22 | Sister | Operator | Pennsylvania |
| 64 | Marjorie H. Dewees | 21 | Sister | Operator | Pennsylvania |
| 65 | August Krings | 50 | Head | Salesman | Germany |
| 66 | Hertha Krings | 45 | Wife | — | Germany |
| 67 | Bertha Schmidt | 76 | Mother-in-law | — | Germany |
| 68 | Susan Sherid | 59 | Lodger | Operator | Pennsylvania |
| 69 | Dorothy Sherid | 17 | Daughter | — | Pennsylvania |
| 70 | Royden Sherid | 32 | Son | — | Pennsylvania |
| 71 | Nunziata Del Pizzo | 60 | Head | Gardener | Italy |
| 72 | Mary Del Pizzo | 55 | Wife | — | Italy |
| 73 | Mabel Del Pizzo | 21 | Daughter | Hairdresser | Pennsylvania |
| 74 | Joseph Fasconi | 40 | Brother-in-law | Gardener | Italy |
| 75 | James Charles Daly | 65 | Head | Tool Maker | New Jersey |
| 76 | Susanah Daly | 63 | Wife | — | England |
| 77 | Kathryn Summer | 40 | Head | Nurse | Virginia |
| 78 | E. Garrett Summer | 16 | Son | — | Pennsylvania |
| 79 | Gloria Summer | 15 | Daughter | — | Pennsylvania |
| 80 | Willard Smith | 54 | Head | Laborer | Pennsylvania |
Pedigree Summary
Isaac
Gen 1 · 6 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)