Multnomah County at a glance
From CMS's public county-level Medicare file. The figure describes the county as a whole, not any one person's options.
Medicare in Multnomah County (CMS data)
CMS counts 139,534 people in Multnomah County as eligible for Medicare, and about 66% of them (91,875) are enrolled in a Medicare Advantage plan (CMS, September 2026).
Multnomah County's Medicare population
In CMS's September 2026 county file, Multnomah County had the largest Medicare-eligible population of Oregon's 36 counties, and about two in three of those residents were enrolled in a Medicare Advantage plan.
The exact share was about 66%. That describes the county as a whole, not any one person. Everyone else gets Medicare another way, most often Original Medicare, and the two paths differ on provider networks, how costs are shared and how coverage works away from home.
If the two paths are new to you, read what Medicare is for a plain-language overview of Parts A, B, C and D.
Reviewing your coverage during the Annual Enrollment Period in Multnomah County
People with Medicare in Multnomah County can review their coverage each year from October 15 through December 7, and changes made then take effect on January 1.
Each fall, people with Medicare in Multnomah County can review their current coverage during the Annual Enrollment Period, October 15 through December 7. Plans can update their costs, provider networks and covered drugs from one year to the next, and may also change which counties they serve, so each member receives an Annual Notice of Change that explains what will be different. Reading it, and checking your own doctors and prescriptions against the plan, is the usual first step. Our Annual Enrollment Period guide explains what you can do in that window. If a life event such as a move opens a different window, the Special Enrollment Periods guide covers the common ones.
SHIBA counseling for Multnomah County
SHIBA, the Senior Health Insurance Benefits Assistance program, is Oregon's State Health Insurance Assistance Program. An Oregon Department of Human Services publication on SHIBA lists 503-988-3646 as the number for the counseling site serving Multnomah County, and gives 800-722-4134 as the statewide line. SHIBA counselors give unbiased information and do not recommend plans.
Oregon's insurance consumer line and the statewide SHIBA program are described in the Medicare in Oregon guide.
Medicare enrollment periods in Multnomah County
Medicare's enrollment windows are set by federal rules, so they are the same in Multnomah County as everywhere else. The 2026 Annual Enrollment Period: October 15 – December 7, 2026. Changes made during the Annual Enrollment Period take effect January 1, 2027.
IEP
Initial Enrollment Period
The Initial Enrollment Period is your personal seven-month window around your 65th birthday. It opens three months before the month you turn 65 and closes three months after. This is when most people enroll in Medicare for the first time.
AEP
Annual Enrollment Period
The Annual Enrollment Period runs from October 15 through December 7 each year. During AEP, people with Medicare can enroll in, change, or drop a Medicare Advantage plan or a Part D plan. Changes made during AEP take effect on January 1 of the following year.
MA OEP
Medicare Advantage Open Enrollment Period
The Medicare Advantage Open Enrollment Period runs from January 1 through March 31. During this window, people already enrolled in Medicare Advantage can make one change: to a different Medicare Advantage plan, or back to Original Medicare, with or without a Part D plan. The change takes effect the first of the month after the plan gets the request.
SEP
Special Enrollment Periods
Special Enrollment Periods open when specific life events happen, such as losing employer coverage or moving to a new area. The timing depends on the event, and Medicare.gov explains the rules for each one.
Where to get Medicare help in Multnomah County
These public programs are listed by official sources. Each one links to the page it came from.
SHIBA counseling site for Multnomah County
An Oregon Department of Human Services publication on the SHIBA program lists 503-988-3646 as the contact for the SHIBA counseling site serving Multnomah County. SHIBA's statewide line is 800-722-4134.
Medicare counseling (SHIP)
Oregon's State Health Insurance Assistance Program is the Senior Health Insurance Benefits Assistance program, known as SHIBA. Its certified counselors give unbiased information and help people understand their Medicare options, but they cannot recommend a plan. Phone: 1-800-722-4134.
Source: Oregon SHIBA (shiba.oregon.gov)
State insurance consumer help
The Oregon Division of Financial Regulation has a dedicated team of consumer advocates. For insurance help, its website lists 1-888-877-4894.
How a licensed independent agent helps in Multnomah County
A licensed independent insurance agent can explain how the parts of Medicare fit together, walk through the enrollment windows that apply to you, and review the plans the agent offers in Multnomah County. The review is educational, and there is no obligation to enroll.
Counselors at a State Health Insurance Assistance Program do not sell insurance. An agent can help with an application, but can only discuss the plans that agent offers, which is why the plan-availability disclosure appears next to the request button on this page.
Before a review, it can help to read about the Annual Enrollment Period and the Special Enrollment Periods that open after certain life events. The Medicare in Oregon guide covers the statewide counseling program and consumer contacts.
Have questions? Review your options with a licensed agent.
Review your Medicare options in Multnomah County
Answer a few questions and a licensed agent will follow up to walk through the plans they offer in your area. Educational, no pressure, and no obligation to enroll.
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FAQ
Medicare questions from Multnomah County
Other county guides in Oregon
The same educational guide for other Oregon counties.
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Related reading
Medicare in Oregon
Enrollment periods, statewide counseling and consumer help in Oregon.
Read more
Medicare Annual Enrollment Period
What the October 15 through December 7 window allows.
Read more
What is Medicare?
A plain-language beginner's guide.
Read more
Medicare Special Enrollment Periods
Life events that open a window outside AEP.
Read more