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EIN 23-7412305

Custer County Historical Society / 1881 Courthouse Museum

IRS 501(c) type
501(c)(3)
Num. employees
Unknown
City
Custer
State
South Dakota
Year formed
1974
Most recent tax filings
2025-12-01
NTEE code, primary
A03: Arts, Culture and Humanities Professional Societies and Associations
Description
Custer County Historical Society / 1881 Courthouse Museum preserves and shares Custer County’s past by collecting, preserving, exhibiting, and publishing historical materials from Custer County and the adjacent Black Hills. The organization stewarded the former courthouse and jail into a museum that now serves as a permanent repository for the region’s history, presenting exhibits that highlight local government and community life alongside Native American history, Lakota clothing and tools, area wildlife, and historic photographs and relics.
Also known as...
1881 Courthouse Museum; 1881 Courthouse Museum
Total revenues
$160,166
2025
Total expenses
$166,997
2025
Total assets
$260,346
2025
Num. employees
n/a

Financials for Custer County Historical Society / 1881 Courthouse Museum

RevenuesFYE 12/2025
Total grants, contributions, etc.$127,699
Program services$19,980
Membership dues$0
Investment income and dividends$4,342
Net gain from sale of non-inventory assets$0
Net income from gaming activities and fundraising events, combined$0
Net income from sales of inventory$4,975
Miscellaneous revenues$3,170
Total revenues$160,166

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Data update history
October 11, 2026
Posted financials
Added Form 990EZ for fiscal year 2025
September 23, 2026
Updated personnel
Identified 4 new personnel
April 7, 2026
Posted financials
Added Form 990EZ for fiscal year 2024
March 16, 2026
Updated personnel
Identified 1 new personnel
August 29, 2024
Posted financials
Added Form 990EZ for fiscal year 2023
Nonprofit Types
Arts, culture, and humanities nonprofitsMuseumsCharities
Issues
Arts, cultural, and humanitiesCommunity improvementHistoryBusiness and industry
Characteristics
Legally formed as corporationPartially liquidatedState / local levelTax deductible donationsAccepts online donations
General information
Address
Post Office Box 826
Custer, SD 57730
Metro area
Rapid City, SD
County
Custer County, SD
Website URL
1881courthousemuseum.org/ 
Phone
(605) 673-2443
IRS details
EIN
23-7412305
Fiscal year end
December
Taxreturn type
Form 990-EZ
Year formed
1974
Eligible to receive tax-deductible contributions (Pub 78)
Yes
Categorization
NTEE code, primary
A03: Arts, Culture and Humanities Professional Societies and Associations
NAICS code, primary
7121: Museums, Historical Sites, and Similar Institutions
Parent/child status
Independent
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