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Mary Koch — 1930 US Census Record

Linked across censuses

1930 United States Federal Census · King, Washington

Our Model Tree links this Mary Koch across the 1920 and 1930 US Censuses in King, Washington (XGBoost, ~Confirmed) — first a daughter (b.~1914), then head of a 7-person household.

Age 16 b. ~1914 Female Daughter Born: Washington Single

1930 Census Record Details

Census Year1930
LocationKing, Washington
SurnameKoch
Given NameMary M
Relationship to HeadDaughter
SexF
Color / RaceWhite
Age16
Marital StatusSingle
BirthplaceWashington
Father's BirthplaceHungary
Mother's BirthplaceHungary
Additional Details
Can Read/WriteYes
Birth StateWashington
Birth CountryUnited States
Birthplace (normalized)washington
Township / WardMartin Creek Precinct
Est. Birth Year~1914

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 1930 census.

Name Relation to head Relative to Mary Age Birth yr
Helen Koch Daughter — 12 ~1918
George Koch Head — 47 ~1883
Mary Koch Daughter — 16 ~1914
Katie Koch Spouse — 35 ~1895
George Koch Son — 19 ~1911
Katie Koch Daughter — 14 ~1916
Alice Koch Daughter — 2 ~1928

Census Appearances

1920
King, Washington
Daughter, age 5
King, Washington · implied b. ~1915 — 7 household members
●  Primary link · ~Confirmed · 2 sources
XGBoost Household
Surname Koch
Given Name Mary
Relationship to Head Daughter
Sex F
Color / Race White
Age 5
Marital Status Single
Birthplace Washington
Father's Birthplace Hungary
Mother's Birthplace Hungary
Birth State Washington
Birth Country United States
Birthplace (normalized) washington
1930
King, Washington
Daughter, age 16
King, Washington · implied b. ~1914 — 7 household members
Surname Koch
Given Name Mary M
Relationship to Head Daughter
Sex F
Color / Race White
Age 16
Marital Status Single
Birthplace Washington
Father's Birthplace Hungary
Mother's Birthplace Hungary
Can Read/Write Yes
Birth State Washington
Birth Country United States
Birthplace (normalized) washington

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.
Linked across censuses
Our Model Tree links Mary Koch across 2 US Census years (1920 and 1930) in King, Washington, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Koch
Daughter · 1930 · age 16 · b. ~1914 · Washington
★ You are viewing this record
Sibling
George Koch
Sibling · 1930 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Koch
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Koch
Sibling · 1930 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Katie Koch
Sibling · 1930 · age 14
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

1930 US Federal Census — King, Washington Open full size

Page Contents

45 people indexed on this census page (ia:1930:15thcensus2490unit:0667)

Line Name Age Relation Occupation Birthplace
1 Henry S Ellefsan 58 Head Cook Wisconsin
2 Hans Ellefsan 56 Brother Laborer Germany
3 George Koch 47 Head Machinist Hungary
4 Katie Koch 35 Wife — Hungary
5 George A Koch 19 Son — Washington
6 Mary M Koch THIS PERSON 16 Daughter — Washington
7 Katie E Koch 14 Daughter — Washington
8 Helen G Koch 12 Daughter — Washington
9 Alice M Koch 2 Daughter — Washington
10 Norma Fegette 27 Head Waitress Washington
11 Juanita L Fegette 7 Daughter — Washington
12 Gertrude Shafer 18 Sister Waitress Washington
13 Frank Jr Bernal 26 Boarder Laborer Washington
14 Axel Dalin 47 Boarder Laborer Sweden
15 George A Gass 56 Head Owner Missouri
16 Carrie B Gass 53 Wife Owner Illinois
17 Mary E Smith 75 Mother-in-law — Kentucky
18 Lee Case 25 Head Logger Washington
19 Florence Case 19 Wife — Oregon
20 Conrad E Goss 32 Head Logger Washington
21 Ruth Goss 23 Wife — Minnesota
22 Elaine Goss 4 Daughter — Washington
23 Marjorie Goss 2 Daughter — Washington
24 Leon Huber 27 Head Logger Oregon
25 Thelma Huber 20 Wife — Missouri
26 Charles W Haltell 47 Head Meat Cutter Minnesota
27 Luther J Proffitt 48 Head Bootlegger New York
28 — None — — —
29 Knutson Kent 22 Boarder Laborer Sweden
30 Gus Gustavson 63 Boarder Laborer Sweden
31 Ruben Olund 33 Boarder Laborer Sweden
32 Victor Anderson 40 Boarder Laborer Sweden
33 Andrew Kauther 47 Boarder Laborer Sweden
34 Oscar E Liebieg 44 Boarder Rr Laborer Louisiana
35 Carl Forsberg 28 Boarder Rr Laborer Sweden
36 Charlie Olson 54 Boarder Laborer Sweden
37 Peter Kraft 50 Boarder Track Man Germany
38 Leonard J Moore 28 Boarder Laborer Missouri
39 Bert Stites 55 Boarder Track Foreman Iowa
40 Bert Lindstrom 25 Boarder Laborer Sweden
41 Carl A Johnson 52 Boarder Laborer Sweden
42 James Flood 64 Boarder Laborer Ireland
43 Robert E Graham 49 Boarder Laborer Connecticut
44 Martin C Hornkinson 48 Boarder Laborer Sweden
45 Albin F Nelson 25 Boarder Logger Sweden

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About This Record & Model Tree

This record was independently indexed by YourRoots from the 1930 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)

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