Bank Branches › Closed and merged banks › Wisconsin › M&I Bank of Southern Wisconsin
What happened to M&I Bank of Southern Wisconsin?
M&I Bank of Southern Wisconsin in Madison, WI (earlier called Bank of Madison and 3 other names) merged into M&I Marshall and Ilsley Bank of Milwaukee, WI on Jun 1, 2001. After 1 more change of hands, what was M&I Bank of Southern Wisconsin is today part of BMO Bank National Association (Chicago, IL).
The chain, step by step
From the day it opened to the bank at the end of the chain today. Each step is one entry in the FDIC's record.
- 1923Bank of Madison opens in Madison, WI
- Feb 1, 1974renamed Affiliated Bank of Madison
- Jun 1, 1981renamed M&I Bank of Madison
- Aug 1, 1991renamed M&I Madison Bank
- Jun 1, 1997renamed M&I Bank of Southern Wisconsin
- Jun 1, 2001MERGEDM&I Bank of Southern Wisconsin merged into M&I Marshall and Ilsley Bank of Milwaukee, WI.FDIC certificate 13042 ends; its business continues under certificate 1020.
- Jul 5, 2011MERGEDM&I Marshall and Ilsley Bank of Milwaukee, WI merged into Harris National Association of Chicago, IL.FDIC certificate 1020 ends; its business continues under certificate 16571.
- TodayOPEN
BMO Bank National AssociationMain office Chicago, IL · FDIC certificate 16571 · 988 offices in 23 states on June 30, 2026Every BMO Bank National Association office → Website on file with the FDIC: www.bmo.com
If you still have something from M&I Bank of Southern Wisconsin
A lien that was never released
If a paid-off mortgage, home-equity line or car loan still shows M&I Bank of Southern Wisconsin as lienholder, start with BMO Bank National Association. In a merger the surviving bank takes over the other bank's loans, so it is the bank to ask for a recordable lien release; if the loan was sold along the way, it can tell you to whom.
The FDIC says it cannot process lien releases for banks that merged or were acquired without government assistance, which is what the record shows here.
Record the release with the same county office that recorded the original mortgage or deed of trust.
An old account, passbook or CD
Ask BMO Bank National Association to search for the account under the name M&I Bank of Southern Wisconsin. A passbook or certificate shows an account existed. It doesn't show the money is still there, and the OCC notes that federal rules require banks to keep most account records for five years.
Accounts nobody touches are eventually turned over to a state. The OCC puts the usual wait at three to five years with no activity, set by each state's law. Search the unclaimed-property program of the state of the owner's last known address on the bank's records, and any other state they lived in. It is free to search and to claim through a state's own site, and MissingMoney.com, an official site of the state administrators' association, searches most states at once.
A safe deposit box
Ask BMO Bank National Association which branch now holds boxes from the M&I Bank of Southern Wisconsin office you used. The OCC says a box with no activity for three to five years (the period is set by state statute) is likely treated as dormant, and its contents may be turned over to the state's unclaimed-property program.
Box contents are not covered by FDIC insurance.
Not sure this is your bank?
Many banks shared a name. Match the city and the years above against your paperwork, or search again with the town.
Credit unions were never FDIC-insured and are not in this record; the NCUA credit union lookup covers those. Banks that closed before about 1970 are not in the FDIC's list either.
One caution: banks also sell single branches. If the office you used was sold to a different bank along the way, the account went with the branch, not with this chain. The office list below shows which bank each office reports under now.
This page is drawn from FDIC records and federal guidance. It is not legal advice, and BankBranches is not a bank or a government office. More detail: lien releases · old passbooks and CDs · safe deposit boxes · unclaimed money.
Where the guidance comes from ▾
Its offices in the FDIC deposit reports
35 offices filed under this charter in some year from 1994 on. 15 are still open as of June 30, 2026.
| Office | Now |
|---|---|
| 1 W Main StMadison, WI | OpenBMO Bank National Association |
| 216 Price PlMadison, WI | OpenBMO Bank National Association |
| 7447 University AveMiddleton, WI | OpenBMO Bank National Association |
| 7801 Mineral Point RdMadison, WI | OpenBMO Bank National Association |
| 4613 Monona DrMonona, WI | OpenBMO Bank National Association |
| 615 Water StSauk City, WI | OpenBMO Bank National Association |
| 1140 W Main StSun Prairie, WI | OpenBMO Bank National Association |
| 4726 E Towne BlvdMadison, WI | OpenBMO Bank National Association |
| 1202 N Sherman AveMadison, WI | OpenBMO Bank National Association |
| 5250 Verona RdMadison, WI | OpenBMO Bank National Association |
| 302 N Iowa StDodgeville, WI | OpenBMO Bank National Association |
| 209 E Jefferson StSpring Green, WI | OpenBMO Bank National Association |
| 127 Jefferson StOregon, WI | OpenBMO Bank National Association |
| 2900 Fish Hatchery RdMadison, WI | OpenBMO Bank National Association |
| 220 N Century AveWaunakee, WI | OpenBMO Bank National Association |
| 237 W Maple StLancaster, WI | No longer reported |
| 4522 Cottage Grove RdMadison, WI | No longer reported |
| 4613 Monona DriveMonona, WI | No longer reported |
| 320 Price PlMadison, WI | No longer reported |
| 5567 Odana RoadMadison, WI | No longer reported |
| 7001 Old Sauk RoadMadison, WI | No longer reported |
| 810 Shorewood BoulevardShorewood Hills, WI | No longer reported |
| 132 South Park StreetReedsburg, WI | No longer reported |
| 259 East Jefferson StreetSpring Green, WI | No longer reported |
| 108 East Court StreetRichland Center, WI | No longer reported |
| 1467 Highway 14 EastRichland Center, WI | No longer reported |
| 1030 Main StreetPlain, WI | No longer reported |
| Main StreetMount Hope, WI | No longer reported |
| 1919 Parmenter StreetMiddleton, WI | No longer reported |
| 101 South Jones StreetBarneveld, WI | No longer reported |
| 7447 University AvenueMiddleton, WI | No longer reported |
| 8383 Greenway BoulevardMiddleton, WI | No longer reported |
| 210 Commercial StBrooklyn, WI | No longer reported |
| 2001 Londonderry DriveMadison, WI | No longer reported |
| 6300 University AvenueMiddleton, WI | No longer reported |
Banks folded into M&I Bank of Southern Wisconsin
4 banks merged directly into this charter; counting the banks those had absorbed earlier, 20 charters end up inside it.
| Bank | Ended |
|---|---|
| M&I Bank SouthwestSpring Green, WI | Jun 1, 1997 |
| Valley BankMadison, WI | Aug 1, 1994 |
| M&I Bank of HilldaleMadison, WI | Aug 1, 1991 |
| M&I Bank of MiddletonMiddleton, WI | Aug 12, 1988 |
Source: FDIC BankFind institution and history records, read Nov 15, 2026. The FDIC's list covers banks that ended in about 1970 or later. Look up certificate 13042 in the FDIC BankFind Suite to see the government's own entry. Corrections: me@byclaude.net.