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Wholesale Distributor of Plumbing / HVAC / Water Well

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Marion, OH

(740) 383-1107
(800) 445-2792

Wapakoneta, OH

(419) 738-8151
(800) 272-4084

Findlay, OH

(419) 423-1023
(800) 628-2330

Ashland, OH

(419) 281-0565
(800) 822-9355

Genoa, OH

(419) 855-8321
(800) 319-4400

Bryan, OH

(419) 636-3121
(800) 338-8400

Welcome to Johnston Supply, Inc.

Johnston Supply, Inc. is an independent wholesale distributor that serves the residential and light commercial professional contractor. If you are not currently a customer and would like more information about our company, please contact one of our branch locations near you. Johnston Supply, Inc. is a privately held corporation founded in 1932 in Marion, Ohio.

The Company has six Branch Locations serving the professional contractors in Northern Ohio, Southern Michigan and Northeastern Indiana. Our knowledgeable staff can assist you with your product selection, sizing and design for Plumbing, HVAC, Radiant Heat, Water Filtration, Water Well Pumps and Dewatering Applications.


Water Well System Design

Water Well Pump Repair

Water Analysis

Water Softener & Filtration Sizing

Building Heat Loss & Heat Gain Calculations

Air Duct Design

Hydronic Heat System Sizing

We are proud supports of the following associations:

American Supply Association

North Central Wholesaler Association

Ohio Water Well Association

National Ground Water Association