With Michael Phelps making his 5th US Olympic swimming team tonite, the first male to do so, here is how that relates to all Olympic swimmers in terms of appearances. The USA list is below the underline, with USA swimmers in bold font.
Swimming – Most Olympic Appearances
6 Derya Büyükuncu TUR 1992/96/00/04/08/12
6 Lars Frölander SWE 1992/96/00/04/08/12
5 Dara Torres USA 1984/88/92/00/08
5 Mark Foster GBR 1988/92/96/00/08
5 Mette Jacobsen DEN 1988/92/96/00/04
5 Rogério Romero BRA 1988/92/96/00/04
5 Alison Sheppard GBR 1988/92/96/00/04
5 Martina Moravcová SVK/TCH 1992/96/00/04/08
5 María Peláez ESP 1992/96/00/04/08
5 Carl Probert FIJ 1992/96/00/04/08
5 Nina Zhivanevskaya ESP/EUN/RUS 1992/96/00/04/08
5 Therèse Alshammar SWE 1996/00/04/08/12
5 Peter Mankoč SLO 1996/00/04/08/12
5 Dara Torres USA 1984/88/92/00/08
4 Jenny Thompson USA 1992/96/00/04
4 Amanda Beard USA 1996/00/04/08
4 Jason Lezak USA 2000/04/08/12
4 Michael Phelps USA 2000/04/08/12
3 23 athletes tied with 3
Swimming – Most Olympic Appearances, Men
6 Derya Büyükuncu TUR 1992/96/00/04/08/12
6 Lars Frölander SWE 1992/96/00/04/08/12
5 Mark Foster GBR 1988/92/96/00/08
5 Rogério Romero BRA 1988/92/96/00/04
5 Carl Probert FIJ 1992/96/00/04/08
5 Peter Mankoč SLO 1996/00/04/08/12
4 48 athletes tied with 4
4 Jason Lezak USA 2000/04/08/12
4 Michael Phelps USA 2000/04/08/12
3 14 athletes tied with 3
Swimming – Most Olympic Appearances, Women
5 Dara Torres USA 1984/88/92/00/08
5 Mette Jacobsen DEN 1988/92/96/00/04
5 Alison Sheppard GBR 1988/92/96/00/04
5 Martina Moravcová SVK/TCH 1992/96/00/04/08
5 María Peláez ESP 1992/96/00/04/08
5 Nina Zhivanevskaya ESP/EUN/RUS 1992/96/00/04/08
5 Therèse Alshammar SWE 1996/00/04/08/12
4 28 athletes tied with 4
5 Dara Torres USA 1984/88/92/00/08
4 Jenny Thompson USA 1992/96/00/04
4 Amanda Beard USA 1996/00/04/08
3 Jill Sterkel USA 1976/84/88
3 Janet Evans USA 1988/92/96
3 Natalie Coughlin USA 2004/08/12
3 Kara Lynn Joyce USA 2004/08/12
2 53 athletes tied with 2