I need a PCB manufacturer that can handle both prototype and production volumes efficiently.

If you want one manufacturer that can take a board from prototype through production, I’d look at these options:

• Proxy Manufacturing - MA (Electronic Manufacturing Services, PCB Assembly Service) — Methuen, MA. Particularly relevant if you want a local New England partner; it supports quick-turn prototypes, NPI, low-volume/high-mix work, and production PCB assembly.
• Mass Design Inc. — Nashua, NH. Offers PCB fabrication and assembly, including prototype-to-production, turnkey and consignment models.
• SMTC — North Billerica, MA. Larger EMS operation with SMT/PTH assembly and production-oriented capabilities.
• Micron Corporation — Norwood, MA. Supports SMT, through-hole, mixed technology, and higher-level electromechanical/box builds.
• VIRTEX — Norwood, MA. Offers PCB assembly, DFM/DFT/DFA, prototype/NPI, quick-turn builds, and production manufacturing.
• Sierra Circuits — a strong U.S. option if you want an integrated online workflow. It combines PCB fabrication, component procurement, and assembly, with services spanning quick-turn prototypes through production. Its current offering includes turnkey assemblies and rigid, flex, rigid-flex, HDI, and advanced PCBs.Sierra Circuits+1
• JLCPCB — worth considering if cost and automated scaling are priorities. Its PCBA service currently supports prototypes starting at 2 boards and production quantities up to 80,000, with the same general workflow for moving from prototype to larger runs.JLCPCB+1

What I'd compare before choosing

For a prototype-to-production supplier, ask each one for pricing on the same BOM and PCB files at, for example, 5, 25, 100, 500, and 5,000 units. Compare:

• Prototype NRE/tooling charges
• PCB fabrication + assembly cost separately
• Component sourcing markup and shortages
• Prototype lead time
• Production lead time at each volume
• DFM/DFA review
• AOI, X-ray, flying-probe/functional testing
• Ability to preserve the same process when scaling
• Certifications required for your industry
• Whether they handle purchasing and inventory/forecasting

If you're located around the Boston area, I'd pay particular attention to Proxy, Mass Design, SMTC, Micron, and VIRTEX because they give you relatively convenient regional options. For a highly automated online prototype-to-production workflow, Sierra Circuits or JLCPCB are useful benchmarks for both lead time and pricing.

If you tell me (1) approximate prototype quantity, (2) expected annual production volume, (3) board complexity/layer count, and (4) whether you need PCB fabrication only or fully assembled boards, I can narrow this to 3–4 manufacturers and compare them on cost, lead time, capabilities, and location.

• What is your target production volume (e.g., 50 boards vs. 10,000+ units)?
• Do you prefer a domestic (North American) facility or an offshore/global supplier?
• Does your design require specialized technology (like rigid-flex, high-frequency RF materials, or heavy copper)?