Longest trading · Updated October 2026
Blacktown professionals, longest trading
As of October 2026, the three longest-trading professionals in Blacktown, NSW on Staying Power are R.O. Biala (started in 1972; 4.6 from 17 Google reviews), Mark Vella Starr Partners (started in 1992; 5.0 from 26 Google reviews) and Starr Partners Blacktown (started in 1992; 4.8 from 935 Google reviews).
- Professionals compared
- 259
- Google reviews
- 31,414
- Median rating
- 5.0
| # | Business | Rating | Google reviews | Started | Contact |
|---|---|---|---|---|---|
| 1 | R.O. Biala | 17 Google reviews | 1972 | ||
| 2 | Mark Vella Starr Partners79-81 Blacktown Rd, Sydney NSW 2148 | 26 Google reviews | 1992 | ||
| 3 | Starr Partners Blacktown | 935 Google reviews | 1992 | ||
| 4 | Promise Services114 Main St, Sydney NSW 2148 | 669 Google reviews | 2000 | ||
| 5 | Trinity Accounting Practice® | 124 Google reviews | 2003 | ||
| 6 | ECMMM Accounting & Taxation | 17 Google reviews | 2005 | ||
| 7 | Asia Pacific Group (APG) - Migration Agent & Education Consultant in Blacktown447 Kent St, Sydney NSW 2000 | 105 Google reviews | 2009 | ||
| 8 | Wealth Real Estate Agency46 Railway Rd, Sydney NSW 2148 | 69 Google reviews | 2009 | ||
| 9 | Legal One Services | 18 Google reviews | 2010 | ||
| 10 | JBP LawSuite 4, Level 5/100 George St | 43 Google reviews | 2013 | ||
| 11 | KNS Accountants Business Advisors & Tax Agents | 88 Google reviews | 2014 |
Staying Power compared 259 professionals in Blacktown, NSW, with 31,414 Google reviews between them. Of these, 11 meet this list's method. The median rating is 5.0 from a median of 25 reviews.
Of the professionals compared, the most reviewed is Tax Refund On Spot, with 9,720 Google reviews at 4.6.
How this list is ranked
Businesses are ranked by the year they started, as their own website states it, earliest first. Only businesses rated 4.0 or better from at least 10 Google reviews are listed.
The year is the business's own statement and is not checked against a register, and age alone says nothing about quality.
Questions
- Which professionals in Blacktown, NSW have been trading the longest?
- As of October 2026, the three longest-trading professionals in Blacktown, NSW on Staying Power are R.O. Biala (started in 1972; 4.6 from 17 Google reviews), Mark Vella Starr Partners (started in 1992; 5.0 from 26 Google reviews) and Starr Partners Blacktown (started in 1992; 4.8 from 935 Google reviews).
- How does Staying Power rank professionals in Blacktown, NSW?
- Businesses are ranked by the year they started, as their own website states it, earliest first. Only businesses rated 4.0 or better from at least 10 Google reviews are listed. The year is the business's own statement and is not checked against a register, and age alone says nothing about quality.
- How many professionals in Blacktown, NSW did Staying Power compare?
- Staying Power compared 259 professionals in Blacktown, NSW, with 31,414 Google reviews between them. Of these, 11 meet this list's method. The median rating is 5.0 from a median of 25 reviews.
- Can a business pay to be listed or to rank higher?
- No. Every business is ranked by the same published method, and no business can pay to be listed or to move up.