›Summary
Duane Morris is mapped by Sartori across 23 offices in 5 countries (Global footprint), headquartered in Philadelphia. Headcount band: 500–1,000 attorneys. Strongest mapped practices: Litigation & Disputes, Corporate & M&A, Employment & Labor. It appears in 5 Ranking Atlas pages. Profile compiled from public facts, last verified 22 Jul 2026.
01 — Public record
Facts on file
Compiled from public sources. Figures are shown as bands where exact counts are not published; nothing here is provided by the firm.
Website
Largest mapped office
Philadelphia, US
Professionals
500–1,000 attorneys banded
Countries covered
5 via 23 offices
Office footprint — mapped metros
23 offices · 5 countriesPrincipal practices
Bold chips mark the firm’s deepest mapped practices (major or strong).
Seniority mix — banded, fee earners
≈400 partners · 225 counsel · 250+ associates
Mapped from public bios and firm pages; exact counts are not published, so figures are shown as approximate bands.
Sartori Firm Index — footprint (a different lens from the Atlas tiers)
Global · coverage 3 of 346.5
Composite SFI
SFI sub-index · banded
72.6
Scale
SFI sub-index · banded
37.7
Reach
SFI sub-index · banded
0.4
Hiring
SFI sub-index · banded
The Sartori Firm Index measures footprint and momentum (scale · reach · hiring), not practice quality. It never assigns an Atlas tier, and the Atlas never reuses this number — the two lenses are deliberately separate.
02 — Where this firm is ranked
Ranking Atlas & Firm Index
No composite firm score is published. Atlas tiers are assigned per market or practice from public footprint and evidence; the Firm Index leaderboards are a separate footprint lens.
5 listings · Atlas tiers apply only within their own market or practice
| Listing | Type | Tier | |
|---|---|---|---|
| Best law firms in Philadelphia | Atlas ranking | Highly active | → |
| Best law firms in Pennsylvania | Atlas ranking | Highly active | → |
| Best law firms in Las Vegas | Atlas ranking | Notable in this field | → |
| Best law firms in Portland | Atlas ranking | Notable in this field | → |
| Best law firms in Pittsburgh | Atlas ranking | Notable in this field | → |
03 — Sources & verification Last verified 22 Jul 2026 · next review by 22 Aug 2026 · change log
Public sources
- 1 Duane Morris LLP - Officesfirm_website · 2026-07-21
- 2 Duane Morris LLP - Offices - Philadelphiafirm_website · 2026-07-21
- 3 Duane Morris LLP - Officesfirm_website · 2026-07-21
- 4 Duane Morris LLP - Offices - New Yorkfirm_website · 2026-07-21
- 5 Duane Morris LLP - Officesfirm_website · 2026-07-21
- 6 Duane Morris LLP - Offices - San Franciscofirm_website · 2026-07-21
- 7 Duane Morris LLP - Officesfirm_website · 2026-07-21
- 8 Duane Morris LLP - Offices - Chicagofirm_website · 2026-07-21
- 9 Duane Morris LLP - Officesfirm_website · 2026-07-21
- 10 Duane Morris LLP - Offices - Washington, D.C.firm_website · 2026-07-21
- 11 Duane Morris LLP - Officesfirm_website · 2026-07-21
- 12 Duane Morris LLP - Offices - Miamifirm_website · 2026-07-21
- 13 Duane Morris LLP - Officesfirm_website · 2026-07-21
- 14 Duane Morris LLP - Officesfirm_website · 2026-07-21
- 15 Duane Morris LLP - Offices - Bostonfirm_website · 2026-07-21
- 16 Duane Morris LLP - Officesfirm_website · 2026-07-21
- 17 Duane Morris LLP - Offices - Atlantafirm_website · 2026-07-21
- 18 Duane Morris LLP - Officesfirm_website · 2026-07-21
- 19 Duane Morris LLP - Officesfirm_website · 2026-07-21
- 20 Duane Morris LLP - Offices - Singaporefirm_website · 2026-07-21
- 21 Duane Morris LLP - Officesfirm_website · 2026-07-21
- 22 Duane Morris LLP - Offices - Philadelphiafirm_website · 2026-07-21
- 23 Duane Morris LLP - Offices - New Yorkfirm_website · 2026-07-21
- 24 Duane Morris LLP - Offices - San Franciscofirm_website · 2026-07-21
- 25 Duane Morris LLP - Offices - Chicagofirm_website · 2026-07-21
- 26 Duane Morris LLP - Offices - Washington, D.C.firm_website · 2026-07-21
- 27 Duane Morris LLP - Offices - Miamifirm_website · 2026-07-21
- 28 Duane Morris LLP - Offices - San Diegofirm_website · 2026-07-21
- 29 Duane Morris LLP - Offices - Bostonfirm_website · 2026-07-21
- 30 Duane Morris LLP - Offices - Atlantafirm_website · 2026-07-21
- 31 Duane Morris LLP - Offices - Northern New Jerseyfirm_website · 2026-07-21
- 32 Duane Morris LLP - Offices - Singaporefirm_website · 2026-07-21
- 33 Duane Morris LLP - Offices - Dallasfirm_website · 2026-07-21
- 34 Singapore's GIC Invests US$135 Million in Vietnam's Nhi Dong 315 Clinic System to Expand Paediatric and Maternity Servicesfirm_website · 2026-07-21
Know the limits of this data
- —Figures are bands, not audited counts; public sources lag reality by weeks or months.
- —Atlas tiers are Sartori’s independent editorial opinion — not the firm’s claim, and not a client-satisfaction measure.
- —No firm-level numeric score exists; Atlas tiers apply only within their own market or practice.
- —No third-party legal-directory band is used as an input.
Corrections from the firm or its representatives are reviewed within five working days.
Change log
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Discuss a mandate →Duane Morris is profiled here independently by Sartori. This page is not affiliated with, endorsed by, or produced in cooperation with the firm; firm names are used for identification only and no logo or brand assets are reproduced. Rankings reflect Sartori’s editorial methodology and public mapping — they are not legal advice, nor a recommendation to instruct counsel.