Contact
- Mailing Address
- Attn: Aaron Mumford, Secretary-Treasurer Business R 1320 S. Callahan RoadWentzville, MO 63385
- Phone
- (314) 434-7310 Guy Callaway Jr, President Listed on the 2025 LM-2 report (opens in new tab)
Officers 10
-
Guy Callaway Jr
President
-
Nathan Rose
Business Manager
-
Aaron Mumford
Secretary-Treasurer Business R
-
Charles Wyka
Vice President
-
Brad Ostmann
Recording Secretary Business R
-
Earl Pryor
Executive Board
-
John Regot III
Executive Board
-
Nick Zerillo
Sergeant at Arms
-
Patrick Case
Auditor
-
Thomas Trendley III
Auditor
An executive officer can send the current list.
Federal Filing
- Members Reported
- 1,334
- Last Report
- 2025
- Form
- LM-2
- File Number
- 16801
Members as the union reported them on its 2025 LM-2 report. Counts may include retirees and associate members.
NLRB cases for Local 660 Elections and unfair labor practice charges on LaborLab Search
Sources 2
- OLMS LM-2 report, 2025 (file no. 016-801) (opens in new tab)
Checked Oct 12, 2026
- OLMS filings for file no. 016-801, labordata.bunkum.us (opens in new tab)
Checked Oct 12, 2026
Listings come from public filings with the U.S. Department of Labor and from the organizations' own websites, as of the dates under Sources. Details change, and we may have them wrong. Check with the organization before you rely on them. Use Suggest an Edit above to tell us what's out of date.