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<PAGE> EXHIBIT 23.1 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated March 8, 2000 relating to the financial statements and financial statement schedules of RCN Corporation, which appears in RCN Corporation's Annual Report on Form 10-K for the year ended December 31, 1999. /s/ PricewaterhouseCoopers LLP PricewaterhouseCoopers LLP Philadelphia, Pennsylvania June 30, 2000
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