WD
William Dennis — 1940 US Census Record
Model Tree available1940 United States Federal Census · King-County, Washington
Our Model Tree links this William Dennis across the 1920, 1930 and 1940 US Censuses in King-County, Washington (XGBoost, ~Confirmed), with identified parents William & William — first a son (b.~1916), then head of a 5-person household.
Age 24
b. ~1916
Male
Son
Born: Montana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | King-County, Washington |
| Surname | Dennis |
| Given Name | William H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | Seattle City |
| 1935 Residence (County) | King |
| Additional Details | |
| Occupation | New Grocery Clerk |
| Industry | Retail Grocery |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Occupation | New Grocery Clerk |
| Township / Ward | Seattle City |
| Est. Birth Year | ~1916 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Mae Dennis | Daughter | — | 20 | ~1920 |
| Leslie Dennis | Head | — | 56 | ~1884 |
| Donna Dennis | Other | — | 20 | ~1920 |
| Newton Miller | Other | — | 63 | ~1877 |
| William Dennis | Son | — | 24 | ~1916 |
Census Appearances
1920
Skagit, Washington
Son, age 3
Skagit, Washington · implied b. ~1917 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dennis |
| Given Name | William Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1930
King, Washington
Son, age 13
King, Washington · implied b. ~1917 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dennis |
| Given Name | William H Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Can Read/Write | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1940
King-County, Washington
Son, age 24
King-County, Washington · implied b. ~1916 — 5 household members
| Surname | Dennis |
| Given Name | William H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | Seattle City |
| 1935 Residence (County) | King |
| Occupation | New Grocery Clerk |
| Industry | Retail Grocery |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
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 William Dennis across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: father William Dennis (~0.92 confidence) and father William Dennis (~0.92 confidence) and father Leslie Dennis (~0.92 confidence) and mother Lottie Dennis (~0.92 confidence) and mother Nellie Dennis (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
William Dennis
b. ~1877
Source father
● Household
· direct · ~0.92
Father
William Dennis
b. ~1879
Source father
● Household
· direct · ~0.92
Father
Leslie Dennis
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Lottie Dennis
b. ~1884
Source mother
● Household
· direct · ~0.92
Mother
Nellie Dennis
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Dennis
Son · 1940 · age 24 · b. ~1916 · Washington
★ You are viewing this record
Sibling
Mae Dennis
Sibling · 1940 · age 20
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 — King-County, Washington
Open full size
1940 US Federal Census — King-County, Washington
Page Contents
35 people indexed on this census page (nara:1940:m-t0627-04383-00733)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 2 | Leslie M Dennis | 56 | Head | — | Missouri |
| 3 | William H Dennis THIS PERSON | 24 | Son | New Grocery Clerk | Montana |
| 4 | Mae Dennis | 20 | Daughter | Stenographer | Washington |
| 5 | Donna M Dennis | 20 | Daughter-in-law | — | Washington |
| 6 | Newton S Miller | 63 | Lodger | Ass'T Mgr | Missouri |
| 8 | John S Campbell | 35 | Head | Automobile Salesman | Maine |
| 9 | Grace Campbell | 32 | Wife | — | Washington |
| 10 | Stephen S Campbell | 3 | Son | — | Washington |
| 12 | David W Trippett | 43 | Head | Coach Bailiff | Indiana |
| 13 | Dorothy E Trippett | 40 | Wife | Beauty Shop Operator | Washington |
| 14 | Dorothy Trippett | 19 | Daughter | — | Washington |
| 15 | Frank E Hark | 34 | Head | Auto Transportation | Washington |
| 16 | Matilda Hark | 25 | Wife | — | Washington |
| 17 | Salked Bafarin | 74 | Head | — | Sweden |
| 18 | James E Morrison | 36 | Head | Truck Driver | Washington |
| 19 | Evelyn Morrison | 34 | Wife | — | Washington |
| 20 | James Jr Morrison | 2 | Son | — | Washington |
| 21 | Julius R Pedersen | 56 | Head | Core Maker | Norway |
| 22 | Juanita Pedersen | 53 | Wife | — | Minnesota |
| 23 | Verna Pedersen | 22 | Daughter | New Worker | Washington |
| 24 | Mary A Penestorf | 52 | Head | Clerk Typist | Washington |
| 25 | Marie Magnuson | 44 | Head | Office Clerk | Sweden |
| 26 | Alice Mcgill | 76 | Mother | — | Washington |
| 28 | Selma S Lofgren | 64 | Head | — | Sweden |
| 29 | Ray E Lofgren | 37 | Son | Office Manager | Washington |
| 30 | Helen Lofgren | 31 | Daughter-in-law | — | Montana |
| 31 | Linda Lofgren | 1 | Granddaughter | — | Washington |
| 32 | Ernest W Davis | 26 | Head | Bookkeeper | Washington |
| 33 | Margaret Davis | 25 | Wife | Social Worker | Washington |
| 35 | Colin Miller | 25 | Head | Time Clerk | Canada English |
| 36 | Olive S Miller | 25 | Wife | Stenographer | Iowa |
| 37 | William Miller | 1 | Son | — | Washington |
| 38 | Magnus Snarland | 54 | Head | Retail Hardware | North Dakota |
| 39 | William Snarland | 49 | Wife | — | Minnesota |
| 40 | Marshall Snarland | 15 | Son | — | Washington |
Pedigree Summary
William + 1 sibling
Gen 1 · 5 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)