Maryland proxies across Baltimore and the DC suburbs

Two Marylands

Baltimore-metro Maryland (Baltimore city, Baltimore County, Anne Arundel, Harford, Howard) sits inside DMA #29 — a distinct regional economy anchored by Johns Hopkins, the Port of Baltimore, Under Armour, and T. Rowe Price. The DC-suburban half of Maryland (Montgomery and Prince George's counties) folds into DMA 8 (Washington), where the commerce pattern matches Northern Virginia more than it matches Baltimore.

Carrier footprint

Comcast (AS7922) is the dominant residential ISP across most of Maryland. Verizon Fios runs fiber in Montgomery County, PG County, and parts of Baltimore. Mobile is three-way competitive, with Verizon slightly dominant in the DC- adjacent MoCo corridor and T-Mobile strong in Baltimore proper.

What Maryland work looks like

Biomedical and research creative. Johns Hopkins, NIH-adjacent research, and the Bethesda biotech cluster make Maryland-IP captures valuable for pharma and academic-publishing creative QA.

Federal-adjacent creative. MoCo-IP residential rotations surface government-contractor aimed creative similar to NoVA, useful for brands targeting the federal workforce specifically.

Retail. Maryland ZIP-level pricing for Giant Food (Ahold Delhaize subsidiary) differs meaningfully from the same SKU at a Giant in NoVA or DC.

Sports. Orioles, Ravens, Wizards, Capitals geo-gated inventory responds to Baltimore / DC-DMA rotations as expected.

MoCo-specific creative testing

Montgomery County's federal-contractor demographic is statistically distinct from DC proper or NoVA. MoCo-IP creative captures often surface:

• Security-cleared jobs board variants (different creative than public-sector-adjacent hiring sites show to non-MoCo traffic).
• Health-insurance open-enrollment creative tuned to federal-employee FEHB (Federal Employees Health Benefits) plan options.
• Real-estate creative targeting the MoCo school-district-obsessed family demographic.

For agencies doing creative QA on federal-adjacent brands, MoCo-IP residential rotation is the right primary pool.

Baltimore port economy

The Port of Baltimore is one of the ten largest US container ports by tonnage and moves outsized shares of US auto imports, roll-on/roll-off cargo, and bulk steel. B2B creative for logistics services, maritime insurance, and port-related commercial real estate responds distinctly to Baltimore-metro IP.

Johns Hopkins research and pharma overlay

Johns Hopkins Medicine is the single largest employer in Maryland and drives a significant share of regional biotech and pharma advertising. Combined with the Frederick / Rockville biotech corridor, Maryland hosts a disproportionate share of US pharma clinical-research-adjacent creative QA. Baltimore-IP captures for pharma brand creative and for academic-publisher landing pages surface the Maryland-specific variant of the creative rotation.

Pool and pricing

Baltimore pool is solid; MoCo / PG pool shares depth with our NoVA allocation. Coast covers statewide; Carrier adds Comcast / Verizon ASN pinning. Neighbors: Virginia, Pennsylvania.