<PAGE>

                                                                      EXHIBIT 24
                                                              POWERS OF ATTORNEY

                                POWER OF ATTORNEY

     KNOWN ALL MEN BY THESE PRESENTS, that the undersigned officer and/or
director of Core Molding Technologies, Inc., a Delaware corporation which is
about to file with the Securities and Exchange Commission, under the provisions
of the Securities Exchange Act of 1934, as amended, an Annual Report on Form
10-K for the fiscal year ended December 31, 2005, hereby constitutes and
appoints James L. Simonton and Herman F. Dick, Jr., and each of them, his true
and lawful attorneys-in-fact and agents with full power of substitution and
resubstitution, for him and in his name, place and stead in any and all
capacities, to sign such Annual Report on Form 10-K, and to file the same with
all exhibits and financial statements and schedules thereto, and other documents
in connection therewith, including any amendment thereto, with the Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises, as fully to
all intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them or their or
his substitute or substitutes may lawfully do or cause to be done by virtue
hereof.

     IN WITNESS WHEREOF, the undersigned has hereunder set his hand this 28th
day of March 2006.


                                        /s/ Ralph O. Hellmold
                                        ----------------------------------------
                                        Ralph O. Hellmold
                                        Director


                                                                              57

<PAGE>

                                POWER OF ATTORNEY

     KNOWN ALL MEN BY THESE PRESENTS, that the undersigned officer and/or
director of Core Molding Technologies, Inc., a Delaware corporation which is
about to file with the Securities and Exchange Commission, under the provisions
of the Securities Exchange Act of 1934, as amended, an Annual Report on Form
10-K for the fiscal year ended December 31, 2005, hereby constitutes and
appoints James L. Simonton and Herman F. Dick, Jr., and each of them, his true
and lawful attorneys-in-fact and agents with full power of substitution and
resubstitution, for him and in his name, place and stead in any and all
capacities, to sign such Annual Report on Form 10-K, and to file the same with
all exhibits and financial statements and schedules thereto, and other documents
in connection therewith, including any amendment thereto, with the Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises, as fully to
all intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them or their or
his substitute or substitutes may lawfully do or cause to be done by virtue
hereof.

     IN WITNESS WHEREOF, the undersigned has hereunder set his hand this 28th
day of March 2006.


                                        /s/ James F. Crowley
                                        ----------------------------------------
                                        James F. Crowley
                                        Director


                                                                              58

<PAGE>

                                POWER OF ATTORNEY

     KNOWN ALL MEN BY THESE PRESENTS, that the undersigned officer and/or
director of Core Molding Technologies, Inc., a Delaware corporation which is
about to file with the Securities and Exchange Commission, under the provisions
of the Securities Exchange Act of 1934, as amended, an Annual Report on Form
10-K for the fiscal year ended December 31, 2005, hereby constitutes and
appoints James L. Simonton and Herman F. Dick, Jr., and each of them, his true
and lawful attorneys-in-fact and agents with full power of substitution and
resubstitution, for him and in his name, place and stead in any and all
capacities, to sign such Annual Report on Form 10-K, and to file the same with
all exhibits and financial statements and schedules thereto, and other documents
in connection therewith, including any amendment thereto, with the Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises, as fully to
all intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them or their or
his substitute or substitutes may lawfully do or cause to be done by virtue
hereof.

     IN WITNESS WHEREOF, the undersigned has hereunder set his hand this 28th
day of March 2006.


                                        /s/ Thomas M Hough
                                        ----------------------------------------
                                        Thomas M. Hough
                                        Director


                                                                              59

<PAGE>

                                POWER OF ATTORNEY

     KNOWN ALL MEN BY THESE PRESENTS, that the undersigned officer and/or
director of Core Molding Technologies, Inc., a Delaware corporation which is
about to file with the Securities and Exchange Commission, under the provisions
of the Securities Exchange Act of 1934, as amended, an Annual Report on Form
10-K for the fiscal year ended December 31, 2005, hereby constitutes and
appoints James L. Simonton and Herman F. Dick, Jr., and each of them, his true
and lawful attorneys-in-fact and agents with full power of substitution and
resubstitution, for him and in his name, place and stead in any and all
capacities, to sign such Annual Report on Form 10-K, and to file the same with
all exhibits and financial statements and schedules thereto, and other documents
in connection therewith, including any amendment thereto, with the Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises, as fully to
all intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them or their or
his substitute or substitutes may lawfully do or cause to be done by virtue
hereof.

     IN WITNESS WHEREOF, the undersigned has hereunder set his hand this 28th
day of March 2006.


                                        /s/ Malcolm M. Prine
                                        ----------------------------------------
                                        Malcolm M. Prine
                                        Director


                                                                              60

<PAGE>

                                POWER OF ATTORNEY

     KNOWN ALL MEN BY THESE PRESENTS, that the undersigned officer and/or
director of Core Molding Technologies, Inc., a Delaware corporation which is
about to file with the Securities and Exchange Commission, under the provisions
of the Securities Exchange Act of 1934, as amended, an Annual Report on Form
10-K for the fiscal year ended December 31, 2005, hereby constitutes and
appoints James L. Simonton and Herman F. Dick, Jr., and each of them, his true
and lawful attorneys-in-fact and agents with full power of substitution and
resubstitution, for him and in his name, place and stead in any and all
capacities, to sign such Annual Report on Form 10-K, and to file the same with
all exhibits and financial statements and schedules thereto, and other documents
in connection therewith, including any amendment thereto, with the Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises, as fully to
all intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them or their or
his substitute or substitutes may lawfully do or cause to be done by virtue
hereof.

     IN WITNESS WHEREOF, the undersigned has hereunder set his hand this 28th
day of March 2006.


                                        /s/ Thomas R. Cellitti
                                        ----------------------------------------
                                        Thomas R. Cellitti
                                        Director


                                                                              61

<PAGE>

                                POWER OF ATTORNEY

     KNOWN ALL MEN BY THESE PRESENTS, that the undersigned officer and/or
director of Core Molding Technologies, Inc., a Delaware corporation which is
about to file with the Securities and Exchange Commission, under the provisions
of the Securities Exchange Act of 1934, as amended, an Annual Report on Form
10-K for the fiscal year ended December 31, 2005, hereby constitutes and
appoints James L. Simonton and Herman F. Dick, Jr., and each of them, his true
and lawful attorneys-in-fact and agents with full power of substitution and
resubstitution, for him and in his name, place and stead in any and all
capacities, to sign such Annual Report on Form 10-K, and to file the same with
all exhibits and financial statements and schedules thereto, and other documents
in connection therewith, including any amendment thereto, with the Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises, as fully to
all intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them or their or
his substitute or substitutes may lawfully do or cause to be done by virtue
hereof.

     IN WITNESS WHEREOF, the undersigned has hereunder set his hand this 28th
day of March 2006.


                                        /s/ John P. Wright
                                        ----------------------------------------
                                        John P. Wright
                                        Director


                                                                              62