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US nonprofit · EIN 930735114 · Canby, ORiSource and licenceOrganisation record IRS Exempt Organizations Business Master File (EIN 930735114) - NTEE activity code, address.Board and officers IRS Form 990 annual filings, Part VII (directors, trustees, officers, key employees), read year by year to observe time served.Latest return IRS Form 990 series e-file data - 990 for the year to 31 December 2024: assets, liabilities, staff, website, telephone, pay.Finances by year IRS Form 990 e-file data - total revenue and total expenses by tax year.Renewal outlook Computed by Governance Register from the observed filing history and filed revenue. Not a statement that the organisation is recruiting.Principal officer IRS Form 990-N (e-Postcard) - principal officer named for tax year 2020.Deductibility IRS Publication 78 data (code PC), downloaded 18 October 2026.Licence US Federal Government public domain.How we handle data

Mark Prairie Historical Society

Donations deductible
Revenue
$13k
year to 31 December 2024
Expenses
$14k
year to 31 December 2024
Total assets
$928k
$767k liabilities
Net assets
$161k
assets less liabilities
Directors and trustees
6
4.4 years on average
Staff
0
employees, year to 31 December 2024
Left since last filing
0
no seats appear to have opened
Voting members
6
reported in Part VI
How am I connected?

Mark Prairie Historical Society's network

6 people4 organisationsi6 people and 4 organisations on this map.The large node is the subject of this page. Solid lines are what the register itself records (6). Violet dotted lines (4) are likely: the same full name sits on the current board of another organisation in the same register and region. Form 990 filings give names without a person identifier; SEC insider filings carry a CIK. It may be a different person.

The board

6 listediTime on the board is observed from the annual filings: the IRS files no appointment date, so the bar counts years from the first filing the person appears on - a lower bound, not a filed start date. Names are exactly as filed. The IRS publishes no person identifier, so this edition does not yet link a person across organisations in the tables. The network map shows same-name matches as likely links only, never as confirmed.Time served and departures are observed across annual filings. Observed time served is a lower bound - a member may have joined before the first year on record. The organisation reported 6 voting members of its governing body on its latest Form 990 Part VI, which matches the board listed here.
NameRole as filedSinceOn the board
Blaine SessionsBoard Member2023
3 yrs
Denyse McGriffVice Preside2023
3 yrs
Erin NelsenCompany secretary2021
5 yrs
Guenevere MilliusTreasurer2021
5 yrs
Judi AUS (also filed as Judi Aus)President2021
5 yrs
Patricia EllisBoard Member2023
3 yrs
Under 5 years5 to 6 years6 years or more

Pay and hours

year to 31 December 2024iFrom Part VII of the Form 990: compensation reported for each officer, director, trustee, key employee and highest-paid staff member, and the average hours a week they report. Most board members are unpaid; a blank means nothing was reported. Pay from related organisations is shown separately.
NameTitle as filedHours a weekPay from the organisationRelated organisationsOther
Judi AusPresident3$0
Denyse McGriffVice Preside2$0
Erin NelsenSecretary2$0
Guenevere MilliusTreasurer3$0
Blaine SessionsBoard Member1$0
Patricia EllisBoard Member2$0

No pay was reported for anyone in Part VII on this return.

About

Legal name
Mark Prairie Historical Society
EIN
930735114
Address
7528 S Mark Rd, Canby, OR, 97013-8605
State
Oregon
Mission
Historic preservation and historic interpretation of the mark prairie schoolhouse and grounds (as filed on the Form 990)
Activity (NTEE)
A82 Arts, culture and humanities
IRS classification
501(c)03 (tax-exempt under section 501(c)(3) where shown)
Classified purpose
Arts, Culture & Humanities
Size band
5 (IRS master file code)
Formed
2010
Principal officer
Judi Aus (as named on the Form 990)
IRS ruling date
1 December 2010
Status
Code 01 (unconditional exemption)
Form 990 filings on record
4, latest 2024
IRS Publication 78
PC (contributions deductible)

Most connected

Longest observed on the filings

≥5years on the filingsErin Nelsen
≥5years on the filingsGuenevere Millius
≥5years on the filingsJudi AUS
≥3years on the filingsBlaine Sessions

Latest return

year to 31 December 2024iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 31 December 2024. US dollars, as filed.
Total assets
$928k
Total liabilities
$767k
Net assets or fund balances
$161k
Contributions and grants received
$12k
Program service revenue
$0
Employees
0

Filed finances

1 yeariTotals as filed on the IRS Form 990 (revenue and expenses), by tax year.
Tax yearTotal revenueTotal expensesSurplus or deficit
2024$13k$14kDeficit $874

As filed on the IRS Form 990. US dollars.

State registration

1 entityiBusiness-entity registers published by US states. These records are matched to this organisation by name and state, not by EIN, and are labelled as likely matches. Street addresses are not shown.
Mark Prairie Historical Society likely matchiMatched by exact name and state (and ZIP where shown). State registers do not publish EINs, so this is not a confirmed match. Source: Oregon Secretary of State, active business entities (data.oregon.gov tckn-sxa6). Licence not stated. Data last fetched 18 October 2026.
State
Oregon
Entity type
nonprofit corporation
Status
Active
Formed
9 February 1949
Registered agent
Gwen Millius (city and state not held)