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Products & Services
About Grimstone Inc
Grimstone Inc. is a paranormal investigation group located in Michigan. We specialize in haunts, ghosts, and spirits. We are Michigan ghost hunters that are ready to serve you.
Its primary NAICS classification is 541720 (Research and Development in the Social Sciences and Humanities). Grimstone Inc is one of 528,309 Industrial & mechanical companies listed in Michigan.
Business Contact Information
- Website
- grimstone-inc.com
- facebook.com/grimstoneinc
- Address
- PO Box 1635, Warren, Michigan, 48090, United States
Industry & Classification
- Industry
- Industrial & mechanical
- Sector
- Commercial services
- Segment
- Office service
NAICS Codes
- 54Professional, Scientific, and Technical Services
- 5417Scientific Research and Development Services
- 541720Research and Development in the Social Sciences and Humanities
SIC Codes
- 87Engineering, Accounting, Research, Management, And Related Services
- 873Research, Development, And Testing Services
- 8732Marketing Research and Public Opinion Polling
Company Details
- Employees
- 35 (21-50)
- Annual Revenue
- $8.2M ($5M-$10M)
Grimstone Inc: frequently asked questions
What does Grimstone Inc do?
Grimstone Inc. is a paranormal investigation group located in Michigan. We specialize in haunts, ghosts, and spirits. We are Michigan ghost hunters that are ready to serve you.
Where is Grimstone Inc located?
Grimstone Inc is headquartered at PO Box 1635, Warren, Michigan, 48090, United States.
How many employees does Grimstone Inc have?
Grimstone Inc has about 35 employees (the 21-50 range).
What is Grimstone Inc's annual revenue?
Grimstone Inc's annual revenue is estimated at $8.2M (the $5M-$10M range).
What industry is Grimstone Inc in?
Grimstone Inc is in the Industrial & mechanical / Commercial services industry, and its primary NAICS code is 541720 (Research and Development in the Social Sciences and Humanities).
How can I contact Grimstone Inc?
Its website is grimstone-inc.com.
Largest companies in Michigan
Largest industrial & mechanical companies
Manufacturing sales in Michigan, 2026
In Michigan, Factur's 2026 study counted 81 manufacturing quotes worth $4.7M and 28 purchase orders over 12 months: 35% of quotes became orders, against 21% nationally. See the Michigan data.
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