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We’ve updated our website! You’ll notice a fresh new look as we’ve made improvements to enhance your experience. As we complete the transition, some areas may continue to settle in, but everything you’re looking for is still here.

Find a branch or ATM near you

Access your accounts anywhere with Mainstreet's convenient branch locations and thousands of Ding Free ATMs across Canada.

Ailsa Craig

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135 Ailsa Craig Main Street
Ailsa Craig, Ontario N0M 1A0

519-293-3947

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Chatham

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40 Keil Drive South
Chatham, Ontario N7M 3G8

519-436-4590

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Corunna

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201 Hill Street
Corunna, Ontario N0N 1G0

519-862-5225

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Goderich

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39 St. David Street
Goderich, Ontario N7A 1L4

519-524-8366

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Mount Brydges

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22478 Adelaide Road
Mount Brydges, Ontario N0L 1W0

519-264-9708

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Parkhill

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B-260 Parkhill Main Street
Parkhill, Ontario N0M 2K0

519-294-6277

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Petrolia

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4128 Petrolia Line
Petrolia, Ontario N0N 1R0

226-738-0793

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Port Lambton

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4348 St. Clair Parkway
Port Lambton, Ontario N0P 2B0

519-677-5652

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Sarnia

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1295 London Road
Sarnia, Ontario N7S 1P6

519-542-9059

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Strathroy

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214 Caradoc Street South
Strathroy, Ontario N7G 2P1

519-245-2530

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