Exhibit 21
                                                                Plexus 2004 10-K

1.    Plexus Services Corp. ("PSC"), a Nevada corporation (f/k/a "Plexus
      Electronic Assembly Corp.)

      a.    Plexus Intl. Sales & Logistics, LLC ("PISL"), a Delaware LLC and
            subsidiary of PEAC

      b.    Plexus QS, LLC, ("PQS"), a Delaware LLC and subsidiary of PEAC

      c.    Plexus Electronica S.de R.L. de C.V., a Mexico entity and subsidiary
            of PSS and PQS

      d.    Plexus Servicios, S.de R.L. de C.V., a Mexico entity and subsidiary
            of PSS and PQS

2.    Plexus International Services, Inc. ("PISI"), a Nevada corporation and
      subsidiary of Plexus Corp.

      a.    Plexus Corp. Limited ("PCL"), a United Kingdom corporation and
            subsidiary of PISI

            (i)   Plexus Corp. (UK) Limited ("PCUKL"), a United Kingdom
                  corporation and subsidiary of PCL

            (ii)  Plexus Corp. (Kelso) Limited, a United Kingdom corporation and
                  subsidiary of PCUKL (inactive)

            (iii) Plexus Corp. (Maldon) Limited, a United Kingdom corporation
                  and subsidiary of PCUKL (inactive)

      b.    Plexus Asia, Ltd. ("PAL"), a British Virgin Islands corporation

            (i)   Plexus (Xiamen) Co., Ltd., a Peoples' Republic of China
                  corporation and subsidiary of PAL

            (ii)  Plexus Manufacturing Sdn. Bhd., a Malaysia corporation and
                  subsidiary of PAL

      c.    Plexus Technology Group, Limited, a United Kingdom corporation and
            subsidiary of PISI (inactive)

3.    PTL Information Technology Services Corp., a Nevada corporation and
      subsidiary of Plexus Corp.

4.    Plexus Management Services Corporation, a Nevada corporation and
      subsidiary of Plexus Corp.